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January 2nd, 2004, 04:53 AM

weisim

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regular expressioins

Hi peoples,

yet another question. OK I don't REALLY understand regular expressions, but I know that that is how I'm supposed to write this code snippet. I was just wondering, if I want to write a snippet of code that checks wether a string has spaces in it or not, how would I go about doing it?

for exampe, if I said
$string = "this is a string";
how could I test wether there was spaces in it?
(as opposed to:
$string = "this_is_a_string";
)

January 2nd, 2004, 06:35 AM

dhouston

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Couple of ways:

PHP Code:


		
			
//Pure regular expression matching a la perl

if(preg_match("/ /",$string){

    //Do stuff.

}

PHP Code:


		
			
//Check the parameter order behind me. This'll match basic patterns, case insensitive.

if(eregi(" ",$string)){

    //Do stuff

}

PHP Code:


		
			
//Again, check my parameter order before trying this.

if(strstr(" ",$string)){

    //Do stuff.

}

These are in the order I'd be likely to use them, from most flexible to least and arguably from most efficient to least.

January 2nd, 2004, 05:53 PM

Mike_r

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How about using \s instead of " "

example

if ( preg_match ( '/(\s)/', $string ) )
{
// dO StUFf
}

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January 3rd, 2004, 10:59 AM

dhouston

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Sure, you can do that. Doesn't really matter either way as far as I know, and I figured " " would make more sense to a regex newbie than "\s".

January 4th, 2004, 04:08 PM

weisim

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hehe... thanks guys, that was EXACTLY what I needed!

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