Commits on Jan 12, 2017

1. Introduce simple regex-like matcher …

   Provide match.Matcher and match.ExactMatcher using regular expressions for
   matching use-case only.
   
   The matchers compile a regular expression into a Matcher, which only provides
   the Match functionality. This gives us a chance to optimize/replace some common
   cases used for matching:
   - replace capture-groups by non-capturing groups
   - remove leading/trailing `.*` expressions (Match already searches for
     sub-string matching the regex)
   - replace simple literal searches with `==` and `strings.Contains` and
     `strings.startsWith`
   - replace regex for alternative literals (e.g. `DEBUG|INFO|ERROR`) with
     strings.Contains over set of literals
   - optimized empty-lines checks
   
   If input regular expression can not be matched to a simple case, regexp.Regexp
   will be used.
   
   The `ExactMatcher` will embedd `<regex>` into `^<regex>$` by default.
   
   Note: Matcher does currently not split simple cases. e.g. `abc.*def` or
   `abc.def` will still fallback to regexp.Regexp.

   urso committed Jan 12, 2017
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