RegExp `x` flag

Isiah Meadows isiahmeadows at gmail.com
Tue Jun 4 03:14:40 UTC 2019


I would personally love this (as well as interpolations in regexp
literals). I do have a concern about whether removing the newline
restriction creates ambiguities with division, but I suspect this is
*not* the case.

-----

Isiah Meadows
contact at isiahmeadows.com
www.isiahmeadows.com

On Mon, Jun 3, 2019 at 10:03 PM Jacob Pratt <jhprattdev at gmail.com> wrote:
>
> Has there been any previous discussion of adding the `x` flag to JS? It exists in other languages, and can make relatively complicated regex _much_ easier to read. It also allows for comments, which are incredibly helpful when trying to understand some regexes.
>
> For prior art, XRegExp has this flag (though I've no idea to figure out how frequently it's used), as do a few other languages.
>
> Quick overview: https://www.regular-expressions.info/freespacing.html
>
> Language references:
> Python: https://docs.python.org/3/library/re.html#re.X
> Rust: https://docs.rs/regex/1.1.6/regex/
> XRegExp: http://xregexp.com/xregexp/flags/#extended
> .NET: https://docs.microsoft.com/en-us/dotnet/standard/base-types/regular-expression-language-quick-reference#regular-expression-options
>
> Jacob Pratt
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