Regular expressions.....Anyone know a good site that describes usage 1

[mit99mh]

I've started using regular expression recently but they are still something of a black art - does anyone know of a good site that explains the basics?

Any help much appreciated.

 

[mwolf00]

http://builder.cnet.com/webbuilding...0698/?tag=st.bl.7701-8-4540096-1.txt.ss050698

Programming today is a race between software engineers striving to build better and bigger idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning. - Rich Cook

 

[snoopy75]

http://www.devguru.com/Technologies/ecmascript/quickref/regexp.html

 

[Tarwn]

4GuysFromRolla has some decent articles on the subject from an ASP point of view, the Java Forum here has a rather long FAQ on the subject that a friend of mine wrote, he even went back and used pretty colors

-Tarwn

 

[mhamilton3]

Regular Expression question
Hello Folks,
I have a regular expression question. I want to make sure a field is at least 6 chacaters and has both numbers and letters in it. It has to have at least one of each - Do I have to walk through each character and check it or can I set up a quick regular expression? Thanks for your help.

- Mark

 

[theEclipse]

mark-

I believe your post would be better served if it were posted by itslef, rather than inside another....nevertheless, as this does pertain to both questions, check this out:

http://www.siteexperts.com/tips/functions/ts23/page1.asp

"Why is it always the quiet ones?"

Robert Carpenter
questions? comments? thanks? email me!
linkemapx@hotmail.com
AIM & MSN: robacarp

 

[TXWizard]

Start with

http://devedge.netscape.com/library/manuals/2000/javascript/1.5/guide/regexp.html#1008506,

which is part of the Netscape "Bible" of JavaScript.

 

[scriptOhead]

mhamilton3-


<script type = &quot;text/javascript&quot;>

var str = &quot;123abc&quot;;

var A = /[a-zA-Z]/;
var B = /[0-9]/;

function X(){

if(str.match(A) && str.match(B) && str.length == 6)
{
window.alert(&quot;Letters + Numbers checks out&quot;
}

}

</script>

 

[onpnt]

thread216-510460

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[TXWizard]

Noticing your use of the Match method of the String object in the example in the last post, I'm wondering if you can offer a suggestion about why the following code is not working.

		window.alert ( 'purl = ' + purl ) ;
		ourl = new String ( purl ) ;						// Create string object for testing.
		if ( ourl instanceof String ) {
			window.alert ( 'Variable ourl is a String object.' ) ;
		} else {
			window.alert ( 'Variable ourl is not a String object.' ) ;
		}
		if ( ourl.search ( /^http/i ) == -1 ) {				// Is URL fully qalified.
			urlisfq = 0 ;									// No.
			window.alert ( 'URL is local.' ) ;
		} else {
			urlisfq = 1 ;									// Yes.
			window.alert ( 'URL is fully qualifed.' ) ;
		}
		a = urlisfq ;										// Set default; no address text box if local URL, else show location bar.
		orx = new RegExp ( '/(\..*?$)/' ) ;
		orx.compile ;
		if ( orx.exec ( ourl ) == -1 ) {					// Does URL have an extension?
			window. alert ( "There is no extension." ) ;
			urlext = '' ;
		} else {
			window. alert ( "There is an extension." ) ;
		 	urlext = RegExp.$1 ;
		}

Running in Internet Explorer 6 SP1, if I feed set variable url to index.html, I expect [$1] to be equal to .html. Instead, it returns blank.

 

[jemminger]

TXWizard,

don't include the regex delimiters &quot;/&quot; when using new RegExp...change to:

orx = new RegExp ( '(\..*?$)' ) ;


also, to see if exec() failed, use:
if ( !orx.exec ( ourl ) ) {
instead of
if ( orx.exec ( ourl ) == -1 ) {

=========================================================
try { succeed(); } catch(E) { tryAgain(); }
-jeff

http://www.jeffemminger.com