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Add RegEx support using RE2 (rebased #665) #1039

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Add RegEx support using RE2 (rebased #665) #1039

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Commits on Nov 29, 2022

  1. Add RegEx support using RE2 

    Introduces 5 new built-in methods to the stdlib:
- `regexFullMatch(pattern, str)` -- Full match regex
- `regexPartialMatch(pattern, str)` -- Partial match regex
- `regexQuoteMeta(str)` -- Escape regex metachararacters
- `regexReplace(str, pattern, to)` -- Replace single occurance using regex
- `regexGlobalReplace(str, pattern, to)` -- Replace globally using regex

Since both `regexFullMatch` and `regexPartialMatch` can perform captures
these functions return a "match" object upon match or `null` otherwise.
For example:

```
$ ./jsonnet -e 'std.regexFullMatch("h(?P<mid>.*)o", "hello")'
{
   "captures": [
      "ell"
   ],
   "namedCaptures": {
      "mid": "ell"
   },
   "string": "hello"
}
```

Introduces a dependency on RE2 2019-06-01.
Builds tested using make, CMake and Bazel on Ubuntu 18.04.
    @dcoles @Duologic
    dcoles authored and Duologic committed Nov 29, 2022
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  2. chore: use newer google/re2 version

    @Duologic
    Duologic committed Nov 29, 2022
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