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

Groups of at least two alphanumeric characters separated by underscores:

/^(([a-zA-Z0-9]+)_)*[a-zA-Z0-9]+$/
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Comment on Re: Looking for a regular expression for the following pattern. Download Code

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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
That matches "1" and "a\n". It doesn't match "a_".	[reply]
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_";` [download] 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.	[reply] [d/l]