Subject:
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Re: Strip surplus white space with Perl
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Newsgroups:
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lugnet.off-topic.geek
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Date:
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Sun, 29 Oct 2000 18:14:55 GMT
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Viewed:
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122 times
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In lugnet.off-topic.geek, Fredrik Glöckner writes:
> Hi, I'm looking into a quick and simple way to strip off all surplus
> white space from a string with Perl. If two consecutive characters
> are <SPACE> and <RET>, for example, it doesn't matter to me which one
> is preserved and which one is chopped off. Any suggestions?
First, if you want to trim any leading and trailing whitespace, this'll do it:
$foo =~ s/^\s+//;
$foo =~ s/\s+$//;
Then, if you need to preserve the first whitespace character and throw out
the rest:
$foo =~ s/(\s)\s+/$1/g;
Or, if spaces (ASCII 32) are always OK in the output string, this is simpler
and marginally faster:
$foo =~ s/\s{2,}/ /g;
Or, if you don't care about speed or memory usage, you could use split and
join:
$foo = join " ", split /\s+/, $foo;
> Yes, I am a Perl novice... :-)
If you'll be learning more Perl, check these out:
http://www.oreilly.com/catalog/lperl2/
http://www.oreilly.com/catalog/pperl3/
And if you'll be using it a lot, but not wanting to learn much, this might be
of help (it's also helpful if you want to learn more too):
http://www.oreilly.com/catalog/cookbook/
And this is an absolutely outstanding book on regexen:
http://www.oreilly.com/catalog/regex/
And there are at least two excellent non-O'Reilly Perl books too:
http://www.effectiveperl.com/
http://www.manning.com/Conway/
HTH,
--Todd
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Message is in Reply To:
 | | Strip surplus white space with Perl
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| Hi, I'm looking into a quick and simple way to strip off all surplus white space from a string with Perl. If two consecutive characters are <SPACE> and <RET>, for example, it doesn't matter to me which one is preserved and which one is chopped off. (...) (24 years ago, 29-Oct-00, to lugnet.off-topic.geek)
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