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JavaScript's Missing RegExp.escape Function
You seek to construct regular expressions from arbitrary strings, but built-in methods elude you. Despite Ruby's convenient RegExp.escape, JavaScript lacks an equivalent.
The Suggested Function
The function recommended in a different thread falls short as it fails to escape characters like ^ (start of string), $ (end of string), and - (used for ranges in character groups).
For a robust solution, consider the following:
function escapeRegex(string) { return string.replace(/[/\-\^$*+?.()|[\]{}]/g, '\$&'); }
This function judiciously escapes all characters crucial for regular expression construction, making it suitable for both character classes and regex literals.
Why is JavaScript Lacking?
The absence of a built-in RegExp.escape in JavaScript remains a vexing issue. This function is indispensable for sanitizing user input before creating regular expressions, preventing potential security vulnerabilities and unexpected behavior.
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