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aarti/negative_la_lb__regexp

Created February 26, 2014 16:51
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Regexp using negative lookahead and negative look behind assertions
Raw
negative_la_lb__regexp
irb(main):040:0> testcases
=> ["hello world", "'hello world", "'hello' world", "hello' world"]
irb(main):041:0> testcases.each { |i| puts /(?<!')hello(?!')/.match(i) }
hello
=> ["hello world", "'hello world", "'hello' world", "hello' world"]
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