Re: Regexp to match regardless of whitespace

There's no modifier that let you skip anything.

If you're just grepping for string literals, it's trivial to change it to allow for spaces:

my $pattern = join '\s*', split //, "whatever";
while (<>) {
    print if /$pattern/;
}
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Otherwise, I'd do as suggested: remove the whitespace in the line, than apply the pattern.