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#!/usr/bin/ruby
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def t(rx, s)
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m = s.match rx
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if m
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printf "MATCH\ns = '%s'\nrx = %p\nmatch = %p\n\n", s, rx, m
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else
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printf "NO MATCH\ns = '%s'\nrx = %p\n\n", s, rx, m
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end
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end
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puts RUBY_DESCRIPTION
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t %r{
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(?<!\\)\( # outer bracket
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.*
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(?<!\\) ([+*]|\{\d+,\}) (?!@) # inner repetition, non possessive
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.*
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(?<!\\)\) # outer bracket
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(?<!\\) (?:[+*]|\{\d+,\}) # unbounded repetition, non possessive
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}x, "f(o+@)+"
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t %r{
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(?<!\\)\( # outer bracket
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.*
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(?<!\\) ([+*]|\{\d+,\}) (?!\+) # inner repetition, non possessive
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.*
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(?<!\\)\) # outer bracket
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(?<!\\) (?:[+*]|\{\d+,\}) # unbounded repetition, non possessive
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}x, "f(o++)+"
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t %r{
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(?<!\\)\( # outer bracket
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.*
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(?<!\\) ([+*]|\{\d+,\}) (?![+]) # inner repetition, non possessive
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.*
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(?<!\\)\) # outer bracket
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(?<!\\) (?:[+*]|\{\d+,\}) # unbounded repetition, non possessive
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}x, "f(o++)+"
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t %r{
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(?<!\\)\( # outer bracket
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.*
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(?<!\\) ([+*]|\{\d+,\}) (?!@) # inner repetition, non possessive
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.*
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(?<!\\)\) # outer bracket
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(?<!\\) (?:[+*]|\{\d+,\}) # unbounded repetition, non possessive
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}x, "f(o+)+"
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t %r{
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(?<!\\)\( # outer bracket
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.*
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(?<!\\) ([+*]|\{\d+,\}) (?!\+) # inner repetition, non possessive
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.*
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(?<!\\)\) # outer bracket
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(?<!\\) (?:[+*]|\{\d+,\}) # unbounded repetition, non possessive
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}x, "f(o+)+"
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