Commits on Jun 2, 2019

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 committed Jun 2, 2019
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