Regex question

[Chris]

I need to write a function that will remove a specified parameter from a
URL. For example:

removeParam("pa ram1", "http://mysite.com/mypage.htm?para m1=1&param2=2") ;

would return:

"http://mysite.com/mypage.htm?para m2=2"

I'm thinking that string.replace(/regex/, ""); would do the trick, but how
do I construct a correct regex?

I see a problem if the parameter name ("param1") happens to contain any
characters that have a special meaning in a regular expression.

[Mick White]

Re: Regex question

Chris wrote:
[color=blue]
> I need to write a function that will remove a specified parameter from a
> URL. For example:
>
> removeParam("pa ram1", "http://mysite.com/mypage.htm?para m1=1&param2=2") ;
>
> would return:
>
> "http://mysite.com/mypage.htm?para m2=2"[/color]

This would be a candidate for string manipulation rather than using reg
ex. But Reg ex is something like the following:

function removeParam(par am,url){
regex=eval("/&?"+param+"=[^&]+&/")
return url.replace(reg ex,'')
}

This should work with any number of queries, characters inside square
brackets don't need to be escaped, I think.

Mick
[color=blue]
>
> I'm thinking that string.replace(/regex/, ""); would do the trick, but how
> do I construct a correct regex?
>
> I see a problem if the parameter name ("param1") happens to contain any
> characters that have a special meaning in a regular expression.
>
>[/color]

[Grant Wagner]

Re: Regex question

Mick White wrote:
[color=blue]
> Chris wrote:
>[color=green]
> > I need to write a function that will remove a specified parameter from a
> > URL. For example:
> >
> > removeParam("pa ram1", "http://mysite.com/mypage.htm?para m1=1&param2=2") ;
> >
> > would return:
> >
> > "http://mysite.com/mypage.htm?para m2=2"[/color]
>
> This would be a candidate for string manipulation rather than using reg
> ex. But Reg ex is something like the following:
>
> function removeParam(par am,url){
> regex=eval("/&?"+param+"=[^&]+&/")[/color]

eval() is evil().

<url: http://jibbering.com/faq/#FAQ4_40 />

Especially when there is a RegExp object constructor that lets you do the same
thing.

var regex = new RegExp("&?" + param + "=[^&]+&");

Also "var" keyword added to avoid scope issues on the "regex" variable.
[color=blue]
> return url.replace(reg ex,'')
> }
>
> This should work with any number of queries, characters inside square
> brackets don't need to be escaped, I think.
>
> Mick[/color]

--
| Grant Wagner <gwagner@agrico reunited.com>

* Client-side Javascript and Netscape 4 DOM Reference available at:
*

http://devedge.netscape.com/library/manuals/2000/javascript/1.3/reference/frames.html

* Internet Explorer DOM Reference available at:
*

http://msdn.microsoft.com/workshop/author/dhtml/reference/dhtml_reference_entry.asp

* Netscape 6/7 DOM Reference available at:
* http://www.mozilla.org/docs/dom/domref/
* Tips for upgrading JavaScript for Netscape 7 / Mozilla
* http://www.mozilla.org/docs/web-deve...upgrade_2.html

[Mick White]

Re: Regex question

Grant Wagner wrote:
[color=blue]
> Mick White wrote:[/color]

[color=blue][color=green]
>>This would be a candidate for string manipulation rather than using reg
>>ex. But Reg ex is something like the following:
>>
>>function removeParam(par am,url){
>>regex=eval( "/&?"+param+"=[^&]+&/")[/color]
>
>
> eval() is evil().[/color]

I disagree, especially when "param" is unknown, and may contain escaped
characters.

Mick
[color=blue]
> <url: http://jibbering.com/faq/#FAQ4_40 />
>
> Especially when there is a RegExp object constructor that lets you do the same
> thing.
>
> var regex = new RegExp("&?" + param + "=[^&]+&");
>
> Also "var" keyword added to avoid scope issues on the "regex" variable.
>
>[color=green]
>>return url.replace(reg ex,'')
>>}
>>
>>This should work with any number of queries, characters inside square
>>brackets don't need to be escaped, I think.
>>
>>Mick[/color]
>
>
> --
> | Grant Wagner <gwagner@agrico reunited.com>
>
> * Client-side Javascript and Netscape 4 DOM Reference available at:
> *
> http://devedge.netscape.com/library/...ce/frames.html
>
> * Internet Explorer DOM Reference available at:
> *
> http://msdn.microsoft.com/workshop/a...ence_entry.asp
>
> * Netscape 6/7 DOM Reference available at:
> * http://www.mozilla.org/docs/dom/domref/
> * Tips for upgrading JavaScript for Netscape 7 / Mozilla
> * http://www.mozilla.org/docs/web-deve...upgrade_2.html
>
>[/color]