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Re^2: Looking for a regular expression for the following pattern.

by ikegami (Patriarch)
on Mar 29, 2018 at 12:39 UTC ( #1211968=note: print w/replies, xml ) Need Help??


in reply to Re: Looking for a regular expression for the following pattern.
in thread Looking for a regular expression for the following pattern.

That matches "1" and "a\n". It doesn't match "a_".

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Re^3: Looking for a regular expression for the following pattern.
by hdb (Monsignor) on Mar 29, 2018 at 13:33 UTC

    Next try...

    /^(([a-zA-Z0-9]{2,}_)*[a-zA-Z0-9]{2,})$/ && print "$_\n" for "1", "a\n", "aa\n", "a_", "aa", "aa_bb_cc_dd", "a1_11_1c_11", +"aaa", "aa_";

    Still matches a trailing newline. It does not match "aa_" on purpose as this is not a sequence of two or more alphanumeric characters separated by underscores which was my claim if not the original question.

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