/o regexp modifier (Ruby compatibility)
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Key: JRUBY-1552
URL: http://jira.codehaus.org/browse/JRUBY-1552
Project: JRuby
Issue Type: Bug
Components: Compiler, Core Classes/Modules, Parser
Affects Versions: JRuby 1.1b1
Environment: Anywhere
Reporter: Kornelius Kalnbach
Ruby regular expressions provide a /o option with the following meaning (from
Pickaxe, forgive me):
o - Substitute Once.
Any #... substitutions in a particular regular expression literal will be
performed just once, the first time it is evaluated. Otherwise, the
substitutions will be performed every time the literal generates a Regexp
object.
JRuby currently ignores the modifier, which results in lower performance when a
library is counting on the feature. For example, CodeRay
(http://coderay.rubyforge.org/) uses it heavily, and runs about 10,000 times
slower with jruby 1.1b1.
Testing the feature is simple:
{{assert Array('a'..'z').map { |c| c.to_s[/#{c}/o] }.compact.size == 1}}
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