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History of Idiom 137 > diff from v21 to v22

Edit summary for version 22 by dmaestro:
New Perl implementation by user [dmaestro]
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Version 21

2018-06-06, 02:38:04

Version 22

2018-08-18, 21:34:50

Idiom #137 Check if string contains only digits

Set boolean b to true if string s contains only characters in range '0'..'9', false otherwise.

Idiom #137 Check if string contains only digits

Set boolean b to true if string s contains only characters in range '0'..'9', false otherwise.

Code 
my $b = $s =~ /^\d*$/;
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Empty string will set True. Change _* to _+ to set False in this case.
Doc URL
https://perldoc.perl.org/perlrequick.html