in reply to Re: Return?
in thread Return?

You mean just the space character? Not for any whitespace?

To check if a string contains only space characters, use

my $string = " "; $string = "Default" if $string =~ /^ *$/;
This sets $string to "Default" if $string consists of 0 or more space characters, and only space characters; if $string is " a " or something such, the regular expression won't match.

If you're looking to match strings that consist only of whitespace (no non-whitespace characters), use:

my $string = " \t \n "; $string = "Default" if $string =~ /^\s*$/;
\s matches whitespace, so this does the same as the last regex, but matches any whitespace (not just space characters).