A regex pattern that worked in 5.8 will also work in 5.10. What did you have in 5.8? 

'^(\S+)\s+(\S+)\s+(\S+)\s+\[([^\]]*)\]\s+\1\z'

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Well, that will continue to work in 5.10. If you wanted to use named captures, 

'^(?<fname>\S+)\s+(?<mname>\S+)\s+(?<lname>\S+)\s+\[(?<date>[^\]]*)\]\
+s+\k<fname>\z'

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PS — Make sure to test your code with the following string: 

"Test Tester Testing [Feb 18: 28_10_10] Tests"

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It shouldn't match ("Test" ne "Tests"), but it's easy to match it if the pattern isn't properly anchored.

In reply to Re: Help required on understanding regular expressions by ikegami
in thread Help required on understanding regular expressions by shekarkcb

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