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Diffstat (limited to 'guides/source')
| -rw-r--r-- | guides/source/active_support_core_extensions.md | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/guides/source/active_support_core_extensions.md b/guides/source/active_support_core_extensions.md index e0b6f2f820..27478b21a0 100644 --- a/guides/source/active_support_core_extensions.md +++ b/guides/source/active_support_core_extensions.md @@ -2916,6 +2916,24 @@ end NOTE: Defined in `active_support/core_ext/regexp.rb`. +### `match?` + +Rails implements `Regexp#match?` for Ruby versions prior to 2.4: + +```ruby +/oo/.match?('foo') # => true +/oo/.match?('bar') # => false +/oo/.match?('foo', 1) # => true +``` + +The backport has the same interface and lack of side-effects in the caller like +not setting `$1` and friends, but it does not have the speed benefits. Its +purpose is to be able to write 2.4 compatible code. Rails itself uses this +predicate internally for example. + +Active Support defines `Regexp#match?` only if not present, so code running +under 2.4 or later does run the original one and gets the performance boost. + Extensions to `Range` --------------------- |