![]() If pattern is a regex, it would also interrogate pattern's source and flags properties instead of coercing pattern to a string.įor example, () would coerce all inputs to strings, but it would throw if the argument is a regex, because it's only designed to match strings, and using a regex is likely a developer mistake. The RegExp() constructor directly returns the pattern argument only if pattern is a regex (among a few other conditions).(), startsWith(), and includes() throw a TypeError if the first argument is a regex. Regex Ignore Space or Whitespace If we want to skip the space or whitespace in the given text we will use -v before the S. ![]() ( exec could also be used, but because it's not a symbol property, there would be too many false positives.) The places that treat regexes specially include: Note the single space between and wordc which means that wordA wordB wordc will not match, but wordA wordB wordc will. This means match wordA followed by 0 or more spaces followed by wordB, but do not match if followed by wordc. This choice was made because is the most indicative property that something is intended to be used for matching. Assuming that it is doing what you want it to.
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