Minifying JavaScript encounters difficulties with specific Regular Expressions

I am facing an issue with minifying a JavaScript file that includes the following working Regex:

isValid = function (str) {
    return !/[~`!#$%\^&*+=\-\[\]\\';,/{}|\\":<>\?]/g.test(str);
},

The error message states:

/* Minification failed. Returning unminified contents.
(2128,43-44): run-time error JS1004: Expected ';': {
(2128,45-46): run-time error JS1195: Expected expression: |
(2128,46-47): run-time error JS1014: Invalid character: \
(2128,47-48): run-time error JS1014: Invalid character: \
(2128,48-70): run-time error JS1015: Unterminated string constant: 
                                     ":<>\?]/g.test(str);
(2129,6-7)  : run-time error JS1195: Expected expression: ,
(2128,17-43): run-time error JS5017: Syntax error in regular expression: 
                                     /[~`!#$%\^&*+=\-\[\]\\';,/ 
*/

Here is the Bundle Config:

bundles.Add(new ScriptBundle("~/bundlesJs/custom").Include(
    "~/Scripts/Autogenerated/AntiHacking/antiHackingHelper.js"
));
BundleTable.EnableOptimizations = true;

What could be the solution to this problem? Do I need to escape a certain character or wrap the entire Regex?

Answer №1

As per the ECMA-262 documentation, it states that the forward slash is not considered a special character in regex.

In JavaScript, the regex engine always allows an unescaped forward slash '/' when using the RegExp constructor notation and even within character classes when written in a regex literal notation. You can test this out with some code examples (compatible with Chrome, Firefox, and checked on IE 11 too):

console.log('1//25///6'.match(/\w[/]+\w/g));
console.log('1//25///6'.match(RegExp("\\w/+\\w", "g")));

However, to follow best practices, it is recommended to escape the regex delimiters to avoid any potential issues and to maintain pattern consistency and clarity.

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