Note that those "newer" regex features are present in all versions of Perl that aren't "end-of-life". The last major version of Perl that didn't have those was 5.8, which dates from July 2002 - less than a year after the release of IE 6.

In reply to Re^2: Loop to merge every two columns by JavaFan
in thread Loop to merge every two columns by Renyulb28

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