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Javascript’s regular expression library is becoming world class, guaranteeing that the odd little pattern language will likely be around for generations to come.

It's been a while since I worked on regexs in JavaScript, but generally the way you do this in most programming languages is to build the regex as a string and then pass it into the regex engine.

Basically, using the /d flag causes the regex engine to include the start and end of all matching substrings. ... JavaScript promises: 4 gotchas and how to avoid them. Jun 4, 2025 8 mins.

That’s what [Low Level JavaScript] points out about regular expressions. Sure, a lot of people think they are scary. So why not write your own regular expression parser and engine ?