William wrote:
> Hello, what is the syntax for having constant in regular expression ? Such as
>
> use constant (NL => '\n');
You know this will create NL as a two-character string - backslash and 'N' -
right? You need double quotes if you want the "\n" control character.
> #check if there is newline in the text
> my $txt = "foo \n bar";
> if($txt =~ m/
> # ???
> /x)
> {
>
> }
Constants are actually subroutines, and a regular expression behaves the same as
a double-quoted string for interpolation, so you can use any of the techniques
described in
perldoc "expand function calls"
in this case it's probably easier to assign the regular expression to a scalar
variable first.
my $newline = qr/\n/;
if ($text =~ $newline) {
:
}
HTH,
Rob
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