d at domenic.me (2015-06-16T16:54:20.699Z)
The point of this last variant is that data gets escaped but RegExp objects
do not -- allowing you to compose RegExps: re`${re1}|${re2}*|${data}`
But this requires one more adjustment:
```
>
> function re(first, ...args) {
> let flags = first;
> function tag(template, ...subs) {
> const parts = [];
> const numSubs = subs.length;
> for (let i = 0; i < numSubs; i++) {
> parts.push(template.raw[i]);
> const subst = subs[i] instanceof RegExp ?
`(?:${subs[i].source})` :
> subs[i].replace(/[\/\\^$*+?.()|[\]{}]/g, '\\amp;');
> parts.push(subst);
> }
> parts.push(template.raw[numSubs]);
> return RegExp(parts.join(''), flags);
> }
> if (typeof first === 'string') {
> return tag;
> } else {
> flags = void 0; // Should this be '' ?
> return tag(first, ...args);
> }
> }
```
The point of this last variant is that data gets escaped but RegExp objects do not -- allowing you to compose RegExps: re`${re1}|${re2}*|${data}` But this requires one more adjustment: > > function re(first, ...args) { > let flags = first; > function tag(template, ...subs) { > const parts = []; > const numSubs = subs.length; > for (let i = 0; i < numSubs; i++) { > parts.push(template.raw[i]); > const subst = subs[i] instanceof RegExp ? `(?:${subs[i].source})` : > subs[i].replace(/[\/\\^$*+?.()|[\]{}]/g, '\\amp;'); > parts.push(subst); > } > parts.push(template.raw[numSubs]); > return RegExp(parts.join(''), flags); > } > if (typeof first === 'string') { > return tag; > } else { > flags = void 0; // Should this be '' ? > return tag(first, ...args); > } > } -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.mozilla.org/pipermail/es-discuss/attachments/20150612/8df7931d/attachment.html>