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Perl does not have a built-in trim function. Use the subroutine below to trim whitespace (spaces and tabs) from the beginning and end of a string in Perl. This function is directly based on the Perl FAQ entry, How do I strip blank space from the beginning/end of a string?. The ltrim and rtrim functions can trim leading or trailing whitespace.
#!/usr/bin/perl# Declare the subroutinessub trim($);sub ltrim($);sub rtrim($);# Create a test stringmy $string = " /t Hello world! ";# Here is how to output the trimmed text "Hello world!"print trim($string)."/n";print ltrim($string)."/n";print rtrim($string)."/n";# Perl trim function to remove whitespace from the start and end of the stringsub trim($){ my $string = shift; $string =~ s/^/s+//; $string =~ s//s+$//; return $string;}# Left trim function to remove leading whitespacesub ltrim($){ my $string = shift; $string =~ s/^/s+//; return $string;}# Right trim function to remove trailing whitespacesub rtrim($){ my $string = shift; $string =~ s//s+$//; return $string;} 转载地址：http://riqmi.baihongyu.com/