Add ends-with operator and fix dataframe operator behavior (#5395)

* add ends-with operator

* escape needles in dataframe operator regex patterns

crates/nu-parser/src/parser.rs

@@ -4049,6 +4049,7 @@ pub fn parse_operator(
         b"not-in" => Operator::NotIn,
         b"mod" => Operator::Modulo,
         b"starts-with" => Operator::StartsWith,
+        b"ends-with" => Operator::EndsWith,
         b"&&" | b"and" => Operator::And,
         b"||" | b"or" => Operator::Or,
         b"**" => Operator::Pow,

crates/nu-parser/src/type_check.rs

@@ -337,6 +337,24 @@ pub fn math_result_type(
                     )
                 }
             },
+            Operator::EndsWith => match (&lhs.ty, &rhs.ty) {
+                (Type::String, Type::String) => (Type::Bool, None),
+                (Type::Any, _) => (Type::Bool, None),
+                (_, Type::Any) => (Type::Bool, None),
+                _ => {
+                    *op = Expression::garbage(op.span);
+                    (
+                        Type::Any,
+                        Some(ParseError::UnsupportedOperation(
+                            op.span,
+                            lhs.span,
+                            lhs.ty.clone(),
+                            rhs.span,
+                            rhs.ty.clone(),
+                        )),
+                    )
+                }
+            },
             Operator::In => match (&lhs.ty, &rhs.ty) {
                 (t, Type::List(u)) if type_compatible(t, u) => (Type::Bool, None),
                 (Type::Int | Type::Float, Type::Range) => (Type::Bool, None),