Re: How do I remove whitespace at the beginning or end of my string?

Remove whitespace at the beginning and end of your string, as well as consecutive whitespace (more than one whitespace character in a row) throughout the string.

$string = join(' ',split(' ',$string));
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Re: Answer: How do I remove whitespace at the beginning or end of my string? by Abigail-II (Bishop) on Jul 14, 2003 at 15:05 UTC
Beside removing whitespace at the beginning and end of the string, the above line will also remove any consecutive white space in the string. Abigail	[reply]
Using a regular expression. by roju (Friar) on Jul 14, 2003 at 17:06 UTC
If you want to preserve internal whitespace, try `s/ #replace ^[\s]* #the start of the string followed by any number of spaces (.) #zero or more characters of anything, stuff into $1. This +is the actual string we want. (?<!\s) #look-behind assertion to get to the last non-whitespace ch +ar \s$ #match whitespace until EOL /$1/x; #replace with the (.)` [download] Update:* If you value your CPU time, use one of the other regular expressions instead. I got caught up in using the ., leading to the need for the look-behind assertion. Better answers can be found here. For the interested, `Benchmark: timing 100000 iterations of my_long_one, one_liner, two_lin +er... my_long_one: 6 wallclock secs ( 4.62 usr + 0.00 sys = 4.62 CPU) @ 2 +1659.09/s (n=100000) one_liner: 3 wallclock secs ( 3.89 usr + 0.00 sys = 3.89 CPU) @ 256 +73.94/s (n=100000) two_liner: 1 wallclock secs ( 2.16 usr + 0.00 sys = 2.16 CPU) @ 462 +10.72/s (n=100000) Using my_long_one => s/^[\s](.)(?<!\s)\s$/$1/ one_liner => s/^\s+\|\s+$//g two_liner => s/^\s+//g; s/s+$//g` [download]	[reply] [d/l] [select]