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Re: Regular Expression Help [message #179347 is a reply to message #179335]

Tue, 09 October 2012 10:29

alvaro.NOSPAMTHANX
Messages: 277
Registered: September 2010

Karma:

Senior Member

El 08/10/2012 6:20, Scott Johnson escribió/wrote:
> But as for the (*), no glory.
> I originally tried
>
> #^Name/11?*#
> #^Name/11\*#
> #^Name/11.*#
>
> It must be obvious I am having issues finding a way to escape the (*)
> and am not very versed with regex.
>
> Can someone please explain the best way to escape an optional (*) from a
> string. Or even point me to a good source.
>
> I used http://www.regular-expressions.info/tutorial.html but was unable
> to find how to handle the star.
>
> And if you bing up the *, it sort of gets ignored.

You need to escape the "*" because it's special char in regular
expressions and the escape character is "\":

http://es.php.net/manual/en/regexp.reference.meta.php

And you need to escape the "\" because it's a special char in PHP strings:

http://es.php.net/manual/en/language.types.string.php

So you need this:

<?php
var_dump( preg_match('/\\*/', '*') );

.... to produce this regular expression:

/\*/

If you find it messy, you can use the built-in escaping function:

<?php
var_dump( preg_match('/' . preg_quote('*', '/') . '/', '*') );
var_dump( preg_match('#' . preg_quote('*', '#') . '#', '*') );

When unsure, always var_dump():

<?php
var_dump( '#' . preg_quote('*', '#') . '#' );

string(4) "#\*#"

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[Message index]

		Regular Expression Help By: Scott Johnson on Mon, 08 October 2012 04:20
		Re: Regular Expression Help By: Captain Paralytic on Mon, 08 October 2012 10:03
		Re: Regular Expression Help By: Denis McMahon on Mon, 08 October 2012 12:49
		Re: Regular Expression Help By: Denis McMahon on Mon, 08 October 2012 12:59
		Re: Regular Expression Help By: BootNic on Mon, 08 October 2012 17:39
		Re: Regular Expression Help By: alvaro.NOSPAMTHANX on Tue, 09 October 2012 10:29
		Re: Regular Expression Help By: Scott Johnson on Wed, 10 October 2012 10:38

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