replace the regex crate with the fancy-regex crate (#6227)

Cargo.lock

@@ -299,6 +299,21 @@ dependencies = [
  "shlex",
 ]
 
+[[package]]
+name = "bit-set"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0700ddab506f33b20a03b13996eccd309a48e5ff77d0d95926aa0210fb4e95f1"
+dependencies = [
+ "bit-vec",
+]
+
+[[package]]
+name = "bit-vec"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "349f9b6a179ed607305526ca489b34ad0a41aed5f7980fa90eb03160b69598fb"
+
 [[package]]
 name = "bit_field"
 version = "0.10.1"
@@ -1119,6 +1134,16 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7360491ce676a36bf9bb3c56c1aa791658183a54d2744120f27285738d90465a"
 
+[[package]]
+name = "fancy-regex"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0678ab2d46fa5195aaf59ad034c083d351377d4af57f3e073c074d0da3e3c766"
+dependencies = [
+ "bit-set",
+ "regex",
+]
+
 [[package]]
 name = "fastrand"
 version = "1.8.0"
@@ -2529,6 +2554,7 @@ version = "0.66.3"
 dependencies = [
  "chrono",
  "crossterm 0.24.0",
+ "fancy-regex",
  "fuzzy-matcher",
  "is_executable",
  "lazy_static",
@@ -2544,7 +2570,6 @@ dependencies = [
  "nu-test-support",
  "nu-utils",
  "reedline",
- "regex",
  "rstest",
  "strip-ansi-escapes",
  "sysinfo",
@@ -2583,6 +2608,7 @@ dependencies = [
  "dtparse",
  "eml-parser",
  "encoding_rs",
+ "fancy-regex",
  "filesize",
  "filetime",
  "fs_extra",
@@ -2624,7 +2650,6 @@ dependencies = [
  "rand 0.8.5",
  "rayon",
  "reedline",
- "regex",
  "reqwest",
  "roxmltree",
  "rstest",
@@ -2678,11 +2703,11 @@ dependencies = [
 name = "nu-json"
 version = "0.66.3"
 dependencies = [
+ "fancy-regex",
  "lazy_static",
  "linked-hash-map",
  "nu-path",
  "num-traits",
- "regex",
  "serde",
  "serde_json",
 ]
@@ -2739,13 +2764,13 @@ dependencies = [
  "byte-unit",
  "chrono",
  "chrono-humanize",
+ "fancy-regex",
  "indexmap",
  "miette 5.1.1",
  "nu-json",
  "nu-path",
  "nu-utils",
  "num-format",
- "regex",
  "serde",
  "serde_json",
  "sys-locale",

crates/nu-cli/Cargo.toml

@@ -20,18 +20,18 @@ nu-utils = { path = "../nu-utils", version = "0.66.3"  }
 nu-ansi-term = "0.46.0"
 nu-color-config = { path = "../nu-color-config", version = "0.66.3"  }
 reedline = { version = "0.9.0", features = ["bashisms", "sqlite"]}
-crossterm = "0.24.0"
-miette = { version = "5.1.0", features = ["fancy"] }
-thiserror = "1.0.31"
-fuzzy-matcher = "0.3.7"
 
 chrono = "0.4.19"
+crossterm = "0.24.0"
+fancy-regex = "0.10.0"
+fuzzy-matcher = "0.3.7"
 is_executable = "1.0.1"
 lazy_static = "1.4.0"
 log = "0.4"
-regex = "1.5.4"
+miette = { version = "5.1.0", features = ["fancy"] }
 strip-ansi-escapes = "0.1.1"
 sysinfo = "0.24.1"
+thiserror = "1.0.31"
 
 [features]
 plugin = []

crates/nu-cli/src/repl.rs

@@ -5,6 +5,7 @@ use crate::{
     util::{eval_source, get_guaranteed_cwd, report_error, report_error_new},
     NuHighlighter, NuValidator, NushellPrompt,
 };
+use fancy_regex::Regex;
 use lazy_static::lazy_static;
 use log::{info, trace, warn};
 use miette::{IntoDiagnostic, Result};
@@ -18,7 +19,6 @@ use nu_protocol::{
     Type, Value, VarId,
 };
 use reedline::{DefaultHinter, Emacs, SqliteBackedHistory, Vi};
-use regex::Regex;
 use std::io::{self, Write};
 use std::{sync::atomic::Ordering, time::Instant};
 use strip_ansi_escapes::strip;
@@ -909,7 +909,7 @@ lazy_static! {
 fn looks_like_path(orig: &str) -> bool {
     #[cfg(windows)]
     {
-        if DRIVE_PATH_REGEX.is_match(orig) {
+        if DRIVE_PATH_REGEX.is_match(orig).unwrap_or(false) {
             return true;
         }
     }

crates/nu-command/Cargo.toml

@@ -41,6 +41,7 @@ digest = "0.10.0"
 dtparse = "1.2.0"
 eml-parser = "0.1.0"
 encoding_rs = "0.8.30"
+fancy-regex = "0.10.0"
 filesize = "0.2.0"
 filetime = "0.2.15"
 fs_extra = "1.2.0"
@@ -64,7 +65,6 @@ powierza-coefficient = "1.0.1"
 quick-xml = "0.23.0"
 rand = "0.8"
 rayon = "1.5.1"
-regex = "1.5.4"
 reqwest = {version = "0.11", features = ["blocking", "json"] }
 roxmltree = "0.14.0"
 rust-embed = "6.3.0"

crates/nu-command/src/core_commands/help.rs

@@ -1,3 +1,4 @@
+use fancy_regex::Regex;
 use nu_ansi_term::{
     Color::{Default, Red, White},
     Style,
@@ -11,7 +12,6 @@ use nu_protocol::{
     ShellError, Signature, Span, Spanned, SyntaxShape, Value,
 };
 use std::borrow::Borrow;
-
 #[derive(Clone)]
 pub struct Help;
 
@@ -350,7 +350,7 @@ pub fn highlight_search_string(
     string_style: &Style,
 ) -> Result<String, ShellError> {
     let regex_string = format!("(?i){}", needle);
-    let regex = match regex::Regex::new(&regex_string) {
+    let regex = match Regex::new(&regex_string) {
         Ok(regex) => regex,
         Err(err) => {
             return Err(ShellError::GenericError(
@@ -367,12 +367,14 @@ pub fn highlight_search_string(
     let mut highlighted = String::new();
 
     for cap in regex.captures_iter(haystack) {
-        let start = match cap.get(0) {
+        match cap {
-            Some(cap) => cap.start(),
+            Ok(capture) => {
+                let start = match capture.get(0) {
+                    Some(acap) => acap.start(),
                     None => 0,
                 };
-        let end = match cap.get(0) {
+                let end = match capture.get(0) {
-            Some(cap) => cap.end(),
+                    Some(acap) => acap.end(),
                     None => 0,
                 };
                 highlighted.push_str(
@@ -383,6 +385,17 @@ pub fn highlight_search_string(
                 highlighted.push_str(&style.paint(&haystack[start..end]).to_string());
                 last_match_end = end;
             }
+            Err(e) => {
+                return Err(ShellError::GenericError(
+                    "Error with regular expression capture".into(),
+                    e.to_string(),
+                    None,
+                    None,
+                    Vec::new(),
+                ));
+            }
+        }
+    }
 
     highlighted.push_str(&string_style.paint(&haystack[last_match_end..]).to_string());
     Ok(highlighted)

crates/nu-command/src/dataframe/values/nu_dataframe/between_values.rs

@@ -1,5 +1,4 @@
 use super::{operations::Axis, NuDataFrame};
-
 use nu_protocol::{ast::Operator, span, ShellError, Span, Spanned, Value};
 use num::Zero;
 use polars::prelude::{
@@ -294,7 +293,7 @@ pub(super) fn compute_series_single_value(
                 compare_series_decimal(&lhs, *val, ChunkedArray::equal, lhs_span)
             }
             Value::String { val, .. } => {
-                let equal_pattern = format!("^{}$", regex::escape(val));
+                let equal_pattern = format!("^{}$", fancy_regex::escape(val));
                 contains_series_pat(&lhs, &equal_pattern, lhs_span)
             }
             Value::Date { val, .. } => {
@@ -406,7 +405,7 @@ pub(super) fn compute_series_single_value(
         },
         Operator::StartsWith => match &right {
             Value::String { val, .. } => {
-                let starts_with_pattern = format!("^{}", regex::escape(val));
+                let starts_with_pattern = format!("^{}", fancy_regex::escape(val));
                 contains_series_pat(&lhs, &starts_with_pattern, lhs_span)
             }
             _ => Err(ShellError::OperatorMismatch {
@@ -419,7 +418,7 @@ pub(super) fn compute_series_single_value(
         },
         Operator::EndsWith => match &right {
             Value::String { val, .. } => {
-                let ends_with_pattern = format!("{}$", regex::escape(val));
+                let ends_with_pattern = format!("{}$", fancy_regex::escape(val));
                 contains_series_pat(&lhs, &ends_with_pattern, lhs_span)
             }
             _ => Err(ShellError::OperatorMismatch {

crates/nu-command/src/filters/find.rs

@@ -1,4 +1,5 @@
 use crate::help::highlight_search_string;
+use fancy_regex::Regex;
 use lscolors::Style as LsColors_Style;
 use nu_ansi_term::{Color::Default, Style};
 use nu_color_config::get_color_config;
@@ -10,7 +11,6 @@ use nu_protocol::{
     Signature, Span, SyntaxShape, Value,
 };
 use nu_utils::get_ls_colors;
-use regex::Regex;
 
 #[derive(Clone)]
 pub struct Find;
@@ -197,18 +197,26 @@ fn find_with_regex(
 
     input.filter(
         move |value| match value {
-            Value::String { val, .. } => re.is_match(val.as_str()) != invert,
+            Value::String { val, .. } => re.is_match(val.as_str()).unwrap_or(false) != invert,
             Value::Record { cols: _, vals, .. } => {
                 let matches: Vec<bool> = vals
                     .iter()
-                    .map(|v| re.is_match(v.into_string(" ", &config).as_str()) != invert)
+                    .map(|v| {
+                        re.is_match(v.into_string(" ", &config).as_str())
+                            .unwrap_or(false)
+                            != invert
+                    })
                     .collect();
                 matches.iter().any(|b| *b)
             }
             Value::List { vals, .. } => {
                 let matches: Vec<bool> = vals
                     .iter()
-                    .map(|v| re.is_match(v.into_string(" ", &config).as_str()) != invert)
+                    .map(|v| {
+                        re.is_match(v.into_string(" ", &config).as_str())
+                            .unwrap_or(false)
+                            != invert
+                    })
                     .collect();
                 matches.iter().any(|b| *b)
             }

crates/nu-command/src/formats/to/html.rs

@@ -1,4 +1,5 @@
 use crate::formats::to::delimited::merge_descriptors;
+use fancy_regex::Regex;
 use nu_engine::CallExt;
 use nu_protocol::ast::Call;
 use nu_protocol::engine::{Command, EngineState, Stack};
@@ -6,7 +7,6 @@ use nu_protocol::{
     Category, Config, Example, IntoPipelineData, PipelineData, ShellError, Signature, Spanned,
     SyntaxShape, Value,
 };
-use regex::Regex;
 use rust_embed::RustEmbed;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;

crates/nu-command/src/strings/parse.rs

@@ -1,3 +1,4 @@
+use fancy_regex::Regex;
 use nu_engine::CallExt;
 use nu_protocol::ast::Call;
 use nu_protocol::engine::{Command, EngineState, Stack};
@@ -5,7 +6,6 @@ use nu_protocol::{
     Category, Example, ListStream, PipelineData, ShellError, Signature, Span, Spanned, SyntaxShape,
     Value,
 };
-use regex::Regex;
 
 #[derive(Clone)]
 pub struct Parse;
@@ -55,6 +55,61 @@ impl Command for Parse {
                 example: "echo \"hi there\" | parse -r '(?P<foo>\\w+) (?P<bar>\\w+)'",
                 result: Some(result),
             },
+            Example {
+                description: "Parse a string using fancy-regex named capture group pattern",
+                example: "echo \"foo bar.\" | parse -r '\\s*(?<name>\\w+)(?=\\.)'",
+                result: Some(Value::List {
+                    vals: vec![Value::Record {
+                        cols: vec!["name".to_string()],
+                        vals: vec![Value::test_string("bar")],
+                        span: Span::test_data()
+                    }],
+                    span: Span::test_data(),
+                }),
+            },
+            Example {
+                description: "Parse a string using fancy-regex capture group pattern",
+                example: "echo \"foo! bar.\" | parse -r '(\\w+)(?=\\.)|(\\w+)(?=!)'",
+                result: Some(Value::List {
+                    vals: vec![
+                        Value::Record {
+                            cols: vec!["Capture1".to_string(), "Capture2".to_string()],
+                            vals: vec![Value::test_string(""), Value::test_string("foo")],
+                            span: Span::test_data()
+                        },
+                        Value::Record {
+                            cols: vec!["Capture1".to_string(), "Capture2".to_string()],
+                            vals: vec![Value::test_string("bar"), Value::test_string("")],
+                            span: Span::test_data(),
+                        }],
+                    span: Span::test_data(),
+                }),
+            },
+            Example {
+                description: "Parse a string using fancy-regex look behind pattern",
+                example: "echo \" @another(foo bar)   \" | parse -r '\\s*(?<=[() ])(@\\w+)(\\([^)]*\\))?\\s*'",
+                result: Some(Value::List {
+                    vals: vec![Value::Record {
+                        cols: vec!["Capture1".to_string(), "Capture2".to_string()],
+                        vals: vec![Value::test_string("@another"), Value::test_string("(foo bar)")],
+                        span: Span::test_data()
+                    }],
+                    span: Span::test_data(),
+                }),
+            },
+            Example {
+                description: "Parse a string using fancy-regex look ahead atomic group pattern",
+                example: "echo \"abcd\" | parse -r '^a(bc(?=d)|b)cd$'",
+                result: Some(Value::List {
+                    vals: vec![Value::Record {
+                        cols: vec!["Capture1".to_string()],
+                        vals: vec![Value::test_string("b")],
+                        span: Span::test_data()
+                    }],
+                    span: Span::test_data(),
+                }),
+            },
+
         ]
     }
 
@@ -89,8 +144,15 @@ fn operate(
         build_regex(&pattern_item, pattern_span)?
     };
 
-    let regex_pattern =
+    let regex_pattern = Regex::new(&item_to_parse).map_err(|err| {
-        Regex::new(&item_to_parse).map_err(|e| parse_regex_error(e, pattern_span))?;
+        ShellError::GenericError(
+            "Error with regular expression".into(),
+            err.to_string(),
+            Some(pattern_span),
+            None,
+            Vec::new(),
+        )
+    })?;
 
     let columns = column_names(&regex_pattern);
     let mut parsed: Vec<Value> = Vec::new();
@@ -102,9 +164,21 @@ fn operate(
 
                 for c in results {
                     let mut cols = Vec::with_capacity(columns.len());
-                    let mut vals = Vec::with_capacity(c.len());
+                    let captures = match c {
+                        Ok(c) => c,
+                        Err(e) => {
+                            return Err(ShellError::GenericError(
+                                "Error with regular expression captures".into(),
+                                e.to_string(),
+                                None,
+                                None,
+                                Vec::new(),
+                            ))
+                        }
+                    };
+                    let mut vals = Vec::with_capacity(captures.len());
 
-                    for (column_name, cap) in columns.iter().zip(c.iter().skip(1)) {
+                    for (column_name, cap) in columns.iter().zip(captures.iter().skip(1)) {
                         let cap_string = cap.map(|v| v.as_str()).unwrap_or("").to_string();
                         cols.push(column_name.clone());
                         vals.push(Value::String {
@@ -156,7 +230,7 @@ fn build_regex(input: &str, span: Span) -> Result<String, ShellError> {
         }
 
         if !before.is_empty() {
-            output.push_str(&regex::escape(&before));
+            output.push_str(&fancy_regex::escape(&before));
         }
 
         // Look for column as we're now at one
@@ -202,35 +276,6 @@ fn column_names(regex: &Regex) -> Vec<String> {
         .collect()
 }
 
-fn parse_regex_error(e: regex::Error, base_span: Span) -> ShellError {
-    match e {
-        regex::Error::Syntax(msg) => {
-            let mut lines = msg.lines();
-
-            let main_msg = lines
-                .next()
-                .map(|l| l.replace(':', ""))
-                .expect("invalid regex pattern");
-
-            let span = lines.nth(1).and_then(|l| l.find('^')).map(|space| {
-                let start = base_span.start + space - 3;
-                Span::new(start, start + 1)
-            });
-
-            let msg = lines
-                .next()
-                .and_then(|l| l.split(':').nth(1))
-                .map(|s| format!("{}: {}", main_msg, s.trim()));
-
-            match (msg, span) {
-                (Some(msg), Some(span)) => ShellError::DelimiterError(msg, span),
-                _ => ShellError::DelimiterError("Invalid regex".to_owned(), base_span),
-            }
-        }
-        _ => ShellError::DelimiterError("Invalid regex".to_owned(), base_span),
-    }
-}
-
 #[cfg(test)]
 mod test {
     use super::*;

crates/nu-command/src/strings/size.rs

@@ -1,3 +1,4 @@
+use fancy_regex::Regex;
 use nu_protocol::ast::Call;
 use nu_protocol::engine::{Command, EngineState, Stack};
 use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, Span, Value};
@@ -265,10 +266,13 @@ impl Count for Counter {
                 // use regex here because it can search for CRLF first and not duplicate the count
                 let line_ending_types = [CRLF, LF, CR, NEL, FF, LS, PS];
                 let pattern = &line_ending_types.join("|");
-                let newline_pattern = regex::Regex::new(pattern).expect("Unable to create regex");
+                let newline_pattern = Regex::new(pattern).expect("Unable to create regex");
                 let line_endings = newline_pattern
                     .find_iter(s)
-                    .map(|f| f.as_str().to_string())
+                    .map(|f| match f {
+                        Ok(mat) => mat.as_str().to_string(),
+                        Err(_) => "".to_string(),
+                    })
                     .collect::<Vec<String>>();
 
                 let has_line_ending_suffix =

crates/nu-command/src/strings/str_/replace.rs

@@ -1,10 +1,10 @@
+use fancy_regex::{NoExpand, Regex};
 use nu_engine::CallExt;
 use nu_protocol::{
     ast::{Call, CellPath},
     engine::{Command, EngineState, Stack},
     Category, Example, PipelineData, ShellError, Signature, Span, Spanned, SyntaxShape, Value,
 };
-use regex::{NoExpand, Regex};
 use std::sync::Arc;
 
 struct Arguments {
@@ -133,6 +133,23 @@ impl Command for SubCommand {
                     span: Span::test_data(),
                 }),
             },
+            Example {
+                description: "Find and replace with fancy-regex",
+                example: r#"'a sucessful b' | str replace '\b([sS])uc(?:cs|s?)e(ed(?:ed|ing|s?)|ss(?:es|ful(?:ly)?|i(?:ons?|ve(?:ly)?)|ors?)?)\b' '${1}ucce$2'"#,
+                result: Some(Value::String {
+                    val: "a successful b".to_string(),
+                    span: Span::test_data(),
+                }),
+            },
+            Example {
+                description: "Find and replace with fancy-regex",
+                example: r#"'GHIKK-9+*' | str replace '[*[:xdigit:]+]' 'z'"#,
+                result: Some(Value::String {
+                    val: "GHIKK-z+*".to_string(),
+                    span: Span::test_data(),
+                }),
+            },
+
         ]
     }
 }

crates/nu-command/src/strings/str_/trim/trim_.rs

@@ -1,3 +1,4 @@
+use fancy_regex::Regex;
 use nu_engine::CallExt;
 use nu_protocol::{
     ast::{Call, CellPath},
@@ -311,7 +312,7 @@ fn trim(s: &str, char_: Option<char>, closure_flags: &ClosureFlags) -> String {
             // create a regex string that looks for 2 or more of each of these characters
             let re_str = format!("{}{{2,}}", reg);
             // create the regex
-            let re = regex::Regex::new(&re_str).expect("Error creating regular expression");
+            let re = Regex::new(&re_str).expect("Error creating regular expression");
             // replace all mutliple occurances with single occurences represented by r
             let new_str = re.replace_all(&return_string, r.to_string());
             // update the return string so the next loop has the latest changes

crates/nu-command/src/system/run_external.rs

@@ -1,3 +1,12 @@
+use fancy_regex::Regex;
+use itertools::Itertools;
+use nu_engine::env_to_strings;
+use nu_engine::CallExt;
+use nu_protocol::engine::{EngineState, Stack};
+use nu_protocol::{ast::Call, engine::Command, ShellError, Signature, SyntaxShape, Value};
+use nu_protocol::{Category, Example, ListStream, PipelineData, RawStream, Span, Spanned};
+use nu_system::ForegroundProcess;
+use pathdiff::diff_paths;
 use std::collections::HashMap;
 use std::io::{BufRead, BufReader, Write};
 use std::path::{Path, PathBuf};
@@ -5,18 +14,6 @@ use std::process::{Command as CommandSys, Stdio};
 use std::sync::atomic::Ordering;
 use std::sync::mpsc;
 
-use nu_engine::env_to_strings;
-use nu_protocol::engine::{EngineState, Stack};
-use nu_protocol::{ast::Call, engine::Command, ShellError, Signature, SyntaxShape, Value};
-use nu_protocol::{Category, Example, ListStream, PipelineData, RawStream, Span, Spanned};
-
-use itertools::Itertools;
-
-use nu_engine::CallExt;
-use nu_system::ForegroundProcess;
-use pathdiff::diff_paths;
-use regex::Regex;
-
 const OUTPUT_BUFFER_SIZE: usize = 1024;
 const OUTPUT_BUFFERS_IN_FLIGHT: usize = 3;
 
@@ -505,7 +502,7 @@ impl ExternalCommand {
 fn has_unsafe_shell_characters(arg: &str) -> bool {
     let re: Regex = Regex::new(r"[^\w@%+=:,./-]").expect("regex to be valid");
 
-    re.is_match(arg)
+    re.is_match(arg).unwrap_or(false)
 }
 
 fn shell_arg_escape(arg: &str) -> String {

crates/nu-command/tests/commands/parse.rs

@@ -184,7 +184,9 @@ mod regex {
                 "#
             ));
 
-            assert!(actual.err.contains("unclosed group"));
+            assert!(actual
+                .err
+                .contains("Opening parenthesis without closing parenthesis"));
         })
     }
 }

crates/nu-json/Cargo.toml

@@ -13,11 +13,11 @@ preserve_order = ["linked-hash-map", "linked-hash-map/serde_impl"]
 default = ["preserve_order"]
 
 [dependencies]
-serde = "1.0"
+fancy-regex = "0.10.0"
-num-traits = "0.2.14"
-regex = "^1.0"
 lazy_static = "1"
 linked-hash-map = { version="0.5", optional=true }
+num-traits = "0.2.14"
+serde = "1.0"
 
 [dev-dependencies]
 nu-path = { path="../nu-path", version = "0.66.3" }

crates/nu-json/src/ser.rs

@@ -12,7 +12,7 @@ use serde::ser;
 
 //use super::util::ParseNumber;
 
-use regex::Regex;
+use fancy_regex::Regex;
 
 use lazy_static::lazy_static;
 

crates/nu-json/tests/main.rs

@@ -1,7 +1,7 @@
 // FIXME: re-enable tests
 /*
 use nu_json::Value;
-use regex::Regex;
+use fancy_regex::Regex;
 use std::fs;
 use std::io;
 use std::path::{Path, PathBuf};

crates/nu-protocol/Cargo.toml

@@ -11,19 +11,20 @@ version = "0.66.3"
 [dependencies]
 nu-utils = { path = "../nu-utils", version = "0.66.3"  }
 nu-path = { path = "../nu-path", version = "0.66.3"  }
-thiserror = "1.0.31"
-miette = { version = "5.1.0", features = ["fancy"] }
-serde = {version = "1.0.130", features = ["derive"]}
-chrono = { version="0.4.19", features=["serde"] }
-indexmap = { version="1.7", features=["serde-1"] }
-chrono-humanize = "0.2.1"
-byte-unit = "4.0.9"
-serde_json = { version = "1.0", optional = true }
 nu-json = { path = "../nu-json", version = "0.66.3"  }
-typetag = "0.1.8"
+
+byte-unit = "4.0.9"
+chrono = { version="0.4.19", features=["serde"] }
+chrono-humanize = "0.2.1"
+fancy-regex = "0.10.0"
+indexmap = { version="1.7", features=["serde-1"] }
+miette = { version = "5.1.0", features = ["fancy"] }
 num-format = "0.4.0"
+serde = {version = "1.0.130", features = ["derive"]}
+serde_json = { version = "1.0", optional = true }
 sys-locale = "0.2.0"
-regex = "1.5.4"
+thiserror = "1.0.31"
+typetag = "0.1.8"
 
 [features]
 plugin = ["serde_json"]

crates/nu-protocol/src/value/mod.rs

@@ -13,11 +13,11 @@ use byte_unit::ByteUnit;
 use chrono::{DateTime, Duration, FixedOffset};
 use chrono_humanize::HumanTime;
 pub use custom_value::CustomValue;
+use fancy_regex::Regex;
 pub use from_value::FromValue;
 use indexmap::map::IndexMap;
 use num_format::{Locale, ToFormattedString};
 pub use range::*;
-use regex::Regex;
 use serde::{Deserialize, Serialize};
 use std::{
     borrow::Cow,
@@ -2178,7 +2178,11 @@ impl Value {
                     .map_err(|e| ShellError::UnsupportedInput(format!("{e}"), *rhs_span))?;
                 let is_match = regex.is_match(lhs);
                 Ok(Value::Bool {
-                    val: if invert { !is_match } else { is_match },
+                    val: if invert {
+                        !is_match.unwrap_or(false)
+                    } else {
+                        is_match.unwrap_or(true)
+                    },
                     span,
                 })
             }

src/tests/test_regex.rs

@@ -63,12 +63,12 @@ fn where_not_works() -> TestResult {
 
 #[test]
 fn invalid_regex_fails() -> TestResult {
-    fail_test(r#"'foo' =~ '['"#, "regex parse error")
+    fail_test(r#"'foo' =~ '['"#, "Invalid character class")
 }
 
 #[test]
 fn invalid_not_regex_fails() -> TestResult {
-    fail_test(r#"'foo' !~ '['"#, "regex parse error")
+    fail_test(r#"'foo' !~ '['"#, "Invalid character class")
 }
 
 #[test]