These patterns are used with the exec() and test() methods of RegExp, and with the match(), matchAll(), replace(), replaceAll(), search(), and split() methods of String. Using regular expressions on Windows hasn’t been particularly easy, as the standard command-line tools have provided very little support to these powerful beasts. Regex optional word not working for simple case. We'll assume we're working in a regex flavor where \d only matches ASCII digits 0 through 9, unlike .NET and Python where that token can match any Unicode digit. They allow you to apply regex operators to the entire grouped regex. if the g flag is not used, only the first complete match and its related capturing groups are returned. No conditionals. The group x matches abc. Non-Capturing While captures provide a lot of power, they can incur quite a performance hit. Jonathan's post was about the non-capturing backreference in Regular Expressions. Negative lookahead. To capture, you must use named groups. This is the "branch reset" pattern, which has the special property that the capture groups are numbered from the same starting point in each alternation branch. Sometimes, though, you need to use parenthesis, but you don't need capturing. Whether . In JavaScript, regular expressions are also objects. (The only exception is Tcl, which treats all groups inside lookahead as non-capturing.) For example / (?

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