RE question
Dave Roe
david_roe at mac.com
Fri May 14 12:29:34 CDT 2004
~sdpm~
On May 14, 2004, at 9:31 AM, Ken Loomis wrote:
> As a web designer that enjoys programming, I joined this group a few
> years ago hoping to become proficient at PERL (or, is it Perl). I have
> learned a lot from looking at the exchanges here, but have to admit
> that RE's still baffle me.
It's Perl. You can learn a lot more at learn.perl.org and/or perldoc.
> I host a discussion board that is apparently being Spam'ed by hackers.
> The board is in Perl and I would like an RE that will strip everything
> except alphanumeric characters from the subject. For example, the
> subject line should only contain A-Z, a-z & 0-9.
From perldoc perlre:
\w Match a "word" character (alphanumeric plus "_")
\W Match a non-"word" character
> The subject line is contained in $FORM('subject'), so I'd like an RE
> that will replace the contents of that variable with the stripped
> version. also, I may decide to allow periods ('.'), and would like to
> see how I'd have to modify that RE to allow that.
You probably meant $FORM{'subject'}. How about:
$FORM{subject} =~ s/\W//g;
which means "change a non-word char into nothing, repeatedly".
$FORM{subject} =~ s/[^\w\.]//g
uses a character class to change anything that is _not_ a word char or
a period into nothing.
Seriously, read perldoc. Start with "perldoc perlrequick" and "perldoc
perlretut".
HTH,
/dave
~sdpm~
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