If you're using string templates, why not do the full regex there, instead of just passing the result to `new RegExp`?
See https://esdiscuss.org/topic/regexp-escape#content-22 and https://esdiscuss.org/topic/regexp-escape#content-28 for some examples, and https://github.com/benjamingr/RegExp.escape/issues/37#issuecomment-126785041 for a discussion of creating a new template string function called `re`. --scott On Fri, Nov 6, 2015 at 12:28 PM, Brian Terlson <[email protected]> wrote: > While looking in to proposals for look-behinds and named capture groups for > ECMAScript RegExps, I thought I’d also think about other oft-requested > features we currently lack: free-spacing and comments. Comments allow a > programmer to embed comments inside the regexp literal. Free-spacing tells > the RegExp engine to ignore spaces, tabs, and line breaks. These two > features go really nicely together to allow human readable regexps – > different parts of a pattern can be split into separate lines with comments > on each line describing what it matches. XRegExp supports both of these > features as well as the RegExp engines in Perl, Java, C# and others. > > > > One challenge with supporting free-spacing in ECMAScript is that we don’t > allow line breaks inside our regexp literal and constructing regexps from > strings is somewhat annoying. The best we could have right now (I think) is > something like: > > > > ``` > > let re = new RegExp(String.raw` > > (\d{3}-)? # area code (optional) > > \d{3}- # prefix > > \d{4} # line number > > `, "x"); > > ``` > > > > I think this is still a win for long confusing patterns, but maybe I’m > alone! Is free-spacing and comments still reasonable if we have to use > string templates? Or is there a nice way to extend the grammar of regular > expression literals to allow for line breaks? (Eg. maybe we only allow > free-spacing with a mode specifier like (?x) inside the pattern?) Any other > thoughts? > > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
