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Diffstat (limited to 'railties/guides/source')
| -rw-r--r-- | railties/guides/source/active_support_overview.textile | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/railties/guides/source/active_support_overview.textile b/railties/guides/source/active_support_overview.textile index 9c3610dc2c..290b1e441e 100644 --- a/railties/guides/source/active_support_overview.textile +++ b/railties/guides/source/active_support_overview.textile @@ -1597,6 +1597,17 @@ def assign_route_options(segments, defaults, requirements) end </ruby> +h4. +optionalize(pattern)+ + +The class method +optionalize+ builds a regexp where the pattern argument is optional. That roughly means it gets a question mark appended with a non-capturing group if needed: + +<ruby> +Regexp.optionalize('') # => '' +Regexp.optionalize('.') # => '.?' +Regexp.optionalize('...') # => '(?:...)?' +</ruby> + +This method is also used by the routing system, it helps in building optional regexp segments. h3. Extensions to +Range+ |