JavaScript Regex Lookbehind Redux
Five years ago I posted Mimicking Lookbehind in JavaScript on this blog, wherein I detailed several ways to emulate positive and negative lookbehind in JavaScript. My approaches back then were all fairly rough, and it was complicated to properly customize any of them to work with a given pattern. Plus, they were only designed to simulate lookbehind in a regex-based replacement. To make it much eas
JavaScript, Regex, and Unicode
Not all shorthand character classes and other JavaScript regex syntax is Unicode-aware. In some cases it can be important to know exactly what certain tokens match, and that's what this post will explore. According to ECMA-262 3rd Edition, \s, \S, ., ^, and $ use Unicode-based interpretations of whitespace and newline, while \d, \D, \w, \W, \b, and \B use ASCII-only interpretations of digit, word
Faster JavaScript Trim
Note 1: The comparison is based on trimming the Magna Carta (over 27,600 characters) with a bit of leading and trailing whitespace 20 times on my personal system. However, the data you're trimming can have a major impact on performance, which is detailed below. Note 2: trim4 and trim6 are the most commonly found in JavaScript libraries today. Note 3: The aforementioned bad implementation is not in
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