Add a function like findRE that will return all sub/group matching.

[razonyang]

Related topic: https://discourse.gohugo.io/t/regular-expressions-sub-matching-groups-not-supported/15368

I would like to create functions that parse and return some stuff of HTML like following.

<ul>
  <li><a href="#foo">Foo</a></li>
  <li><a href="#bar">Bar</a></li>
</ul>

pattern := `<a.*href="(.+)">(.+)</a>`

Result (something like this)

[
  [
    "<a href=\"#foo\">Foo</a>",
    "#foo"
    "Foo"
  ],
  [
    "<a href=\"#bar\">Bar</a>",
    "#bar"
    "Bar"
  ]
]

[jmooring]

I believe that FindAllStringSubmatch provides the desired functionality, but I am concerned that site developers will have a difficult time wrapping their heads around this.

For your specific example, you can do this:

{{ $str := `
  <ul>
    <li><a href="#foo">Foo</a></li>
    <li><a href="#bar">Bar</a></li>
  </ul>
`}}


{{ $s := slice }}
{{ range $match := findRE `<a.+a>` $str }}
  {{ $s = $s | append (
    slice (
      slice
        $match
        (replaceRE `.+"(.+)".+` "$1" $match)
        (replaceRE `.*>(.+)<.+` "$1" $match)
      )
    )
  }}
{{ end }}

The resulting data structure (jsonified)...

[
  [
    "\u003ca href=\"#foo\"\u003eFoo\u003c/a\u003e",
    "#foo",
    "Foo"
  ],
  [
    "\u003ca href=\"#bar\"\u003eBar\u003c/a\u003e",
    "#bar",
    "Bar"
  ]
]

[razonyang]

@jmooring Thank you for the workaround, but I'm concerned about the performance between FindAllStringSubmatch and the findRE + N x replaceRE. I think it is worthwhile if the former has obvious performance. But I don't know how to benchmark.

but I am concerned that site developers will have a difficult time wrapping their heads around this.

I think it's related to the documentations.

[bep]

I don't think we need to benchmark to to show the value, and I have needed this myself in some cases.

[github-actions]

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