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/s: Make . match newline (normally it doesn't)
/m: Make ^ match at beginning of line (after a newline) rather than beginning of string, and similarly $
Example: Suppose $message contains an entire mail message.
($subject) = ($message =~ /^(Subject:\s+(.|\n\s)*)$/m);
Extracts Subject field.
If you use /m, use \A and \Z to get the old meanings of ^ and $: Match at beginning or end of string only
Recall that $ normally matches before a newline at the end of the string. \Z does that too.
If you really want to match only at the end of the string, use \z
Perl 6 will fix this mess; /s and /m are going away:
^ beginning of string
$ end of string
^^ beginning of line
$$ end of line
. match any single character
\n match a newline
\N match any single character except a newline
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Copyright © 2002 M. J. Dominus |