Re: How to grep for a filename for each of the keys of a hash

$filename is not a regular expression, use eq

The metacharacter . will match a space

use YAPE::Regex::Explain;
print YAPE::Regex::Explain->new(qr/\s(.:.+?)/ )->explain;
__END__
The regular expression:

(?-imsx:\s(.:.+?))

matches as follows:

NODE                     EXPLANATION
----------------------------------------------------------------------
(?-imsx:                 group, but do not capture (case-sensitive)
                         (with ^ and $ matching normally) (with . not
                         matching \n) (matching whitespace and #
                         normally):
----------------------------------------------------------------------
  \s                       whitespace (\n, \r, \t, \f, and " ")
----------------------------------------------------------------------
  (                        group and capture to \1:
----------------------------------------------------------------------
    .                        any character except \n
----------------------------------------------------------------------
    :                        ':'
----------------------------------------------------------------------
    .+?                      any character except \n (1 or more times
                             (matching the least amount possible))
----------------------------------------------------------------------
  )                        end of \1
----------------------------------------------------------------------
)                        end of grouping
----------------------------------------------------------------------
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Space, followed by notSpace, at the end of the string, ie /\s(\S+)$/ or /\s(\S+)\z/

or with substr/rindex

$ perl -le"my $f = q!a b c d ee!; print substr $f, 1+rindex $f, q! !"
ee
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