[RESOLVED] RegExp is not working right...

[the_dp]

Hello,

I'm trying to use the following pattern with RegExp, but it doesn't seem to work right. When I take the same expression and use it directly, the expression works correctly.

The expression is designed to find numbers or numbers with letter at the end.
The example below should not find any match in the string.
The RegExp example finds "ld". Why? What am I doing wrong?

var str = "printf(\"Hello World\");";
	
var myPattern = new RegExp("([^\w][\d]+[\w]*)|(^[\d]+[\w]*)");
alert(str.search(myPattern));
	
alert(str.search(/([^\w][\d]+[\w]*)|(^[\d]+[\w]*)/));

Thank you.

[Nedals]

alert(str.search(/^\d+\w$/));

^     begining of string
\d+   one or more numbers 
\w    one number or letter only
$     END OF STRING

[the_dp]

alert(str.search(/^\d+\w$/));

^     begining of string
\d+   one or more numbers 
\w    one number or letter only
$     END OF STRING

I'm sorry that's not what I asked.
My expression, when used through RegExp doesn't work like it should, and when used directly with / / it works great, why???

[Nedals]

Hmm - I guess 'myPattern' does not interpolate within an alert

var str = "printf(\"Hello World\");";
var myPattern = new RegExp("([^\w][\d]+[\w]*)|(^[\d]+[\w]*)");

var result = str.search(myPattern);
alert(str.search(result));

Just for reference,
Your regex will match a lot more than ONLY numbers follows by one letter or number.

[mrhoo]

When you create a RegExp from a string with new RegExp('string') you have to be careful to escape the escapes.

var myPattern = new RegExp("([^\\w][\\d]+[\\w]*)|(^[\\d]+[\\w]*)")

Otherwise, the RegExp you create is: /([^w][d]+[w]*)|(^[d]+[w]*)/;// from alert(myPattern)

So you returned the first character that is not a 'w' and is followed by some number of 'd's followed by zero or more 'w's- 'ld'.

[the_dp]

When you create a RegExp from a string with new RegExp('string') you have to be careful to escape the escapes.

var myPattern = new RegExp("([^\\w][\\d]+[\\w]*)|(^[\\d]+[\\w]*)")

Otherwise, the RegExp you create is: /([^w][d]+[w]*)|(^[d]+[w]*)/;// from alert(myPattern)

So you returned the first character that is not a 'w' and is followed by some number of 'd's followed by zero or more 'w's- 'ld'.

Of course....Thank you.