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Regex in JavaScript/RegExp constructor

Build a regex dynamically from strings.

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Section: JavaScript Regex APIs

RegExp constructor

javascript
javascript
new RegExp("^" + prefix + "\\d+$", "i")
Explanation

Useful when the pattern is assembled at runtime.

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Regex literal
Declare a regex using JavaScript literal syntax.
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test() boolean match
Check whether a regex matches a string.
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exec() detailed match
Get captures and index information from a match.
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String.match()
Match against a string and return results.
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String.matchAll()
Iterate all matches with captures.
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String.replace()
Replace matched text using a regex.
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