xregexp-like regexp/tag.ts

[wojpawlik]

Small utility for combining regular expressions and strings, without worrying about escaping (#3330).

See https://xregexp.com/api/#tag and https://github.com./fromdeno/deno2node/blob/main/src/util/regexp.ts

[jeff-hykin]

I made a little tool like this, and I have thought about creating a PR for it. I tried to do the flags a bit more elegantly

import { regex } from "https://deno.land/x/[email protected]/string.js"
import { assertEquals } from "https://deno.land/[email protected]/testing/asserts.ts"

const pattern = regex`(not escaped) ${"(escaped)"} ${/(not escaped)/}`.gi
assertEquals(pattern, /(not escaped) \(escaped\) (?:(not escaped))/gi )

const pattern = regex`a`.ig
assertEquals(pattern, /a/gi)

If this looks good I'll clean it up with some jsdoc and type annotations