Jasmine
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Apr 6, 2000, 4:21 PM
Post #2 of 3
(707 views)
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Perl documentation on Regular Expressions: http://www.perlguru.com/perldocs/pod/perlre.html
To find out if a word ends in a particular character and then delete that character, you would use a simple substitution expression. Pattern matches with substitions are made in this format:
$texttocheck =~ s/findthis/replacewiththis/;
To look for something at the end of the string, you need to enter a dollar sign after the text to match.
$texttocheck =~ s/findthis$/replacewiththis/;
To look for something at the beginning of the string, put a caret in front of the text to match.
$texttocheck =~ s/^findthis/replacewiththis/;
So if you want to remove the last s from a string, your code would look like this:
<BLOCKQUOTE><font size="1" face="Arial,Helvetica,sans serif">code:</font><HR>
$word = "Take this";
$word =~ s/s$//;
print $word;
# prints Take thi
</pre><HR></BLOCKQUOTE>
The following code will catch most incorrectly formatted email addresses:
<BLOCKQUOTE><font size="1" face="Arial,Helvetica,sans serif">code:</font><HR>
if ($email =~ /^[\w\-]+[\w\-\.]*\@[\w\-]+[\w\-\.]*\.[A-Za-z][A-Za-z]+$/){
#email is valid
}
else{
#email is not valid
}
</pre><HR></BLOCKQUOTE>
There's no way other than actually sending an message to an email address (and perhaps getting a bounced message) to determine if it actually exists.
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