Perl One-Liners by Peteris Krumins

Author:Peteris Krumins
Language: eng
Format: epub, mobi
Tags: COMPUTERS / Programming Languages / Perl
ISBN: 9781593275693
Publisher: No Starch Press
Published: 2013-11-22T16:00:00+00:00

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However, this line wouldn’t be printed because it also contains some characters:

8388338 foo bar random data 999

You can also invert the ^\d$ regular expression and use \D:

perl -lne 'print unless /\D/'

This one-liner is great for developing your logical reasoning because it uses logical negation twice. Here, the line prints only if it does not contain a non-numeric character. In other words, it prints only if all the characters are numeric. (Notice that I used the -l command-line argument for this one-liner because of the newline character at the end of the line. If I didn’t use -l, the line would contain the newline character—a non-numeric character—and it wouldn’t be printed.)

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