diff options
| -rw-r--r-- | lib/gitlab/untrusted_regexp.rb | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/lib/gitlab/untrusted_regexp.rb b/lib/gitlab/untrusted_regexp.rb index 14126b6ec06..c237f4a7404 100644 --- a/lib/gitlab/untrusted_regexp.rb +++ b/lib/gitlab/untrusted_regexp.rb @@ -47,6 +47,19 @@ module Gitlab self.source == other.source end + # Handles regular expressions with the preferred RE2 library where possible + # via UntustedRegex. Falls back to Ruby's built-in regular expression library + # when the syntax would be invalid in RE2. + # + # One difference between these is `(?m)` multi-line mode. Ruby regex enables + # this by default, but also handles `^` and `$` differently. + # See: https://www.regular-expressions.info/modifiers.html + def self.with_fallback(pattern, multiline: false) + UntrustedRegexp.new(pattern, multiline: multiline) + rescue RegexpError + Regexp.new(pattern) + end + private attr_reader :regexp |