trim string in javascript

[Jon Kelling]

for all your javascript trimming needs...

function trim(inputStrin g) {
if (typeof inputString != "string") return inputString;
return inputString
//clear leading spaces and empty lines
.replace(/^(\s|\n|\r)*((. |\n|\r)*?)(\s|\ n|\r)*$/g,"$2")

//take consecutive spaces down to one
.replace(/(\s(?!(\n|\r))( ?=\s))+/g,"")

//take consecutive lines breaks down to one
.replace(/(\n|\r)+/g,"\n\r")

//remove spacing at the beginning of a line
.replace(/(\n|\r)\s/g,"$1")

//remove spacing at the end of a line
.replace(/\s(\n|\r)/g,"$1");
}

-- Jon

[Michael Winter]

Re: trim string in javascript

On 6 May 2004 07:48:53 -0700, Jon Kelling <skater0i@mac.c om> wrote:

[snip]
[color=blue]
> //clear leading spaces and empty lines
> .replace(/^(\s|\n|\r)*((. |\n|\r)*?)(\s|\ n|\r)*$/g,"$2")[/color]

Clears leading spaces, but not empty lines.
[color=blue]
> //take consecutive spaces down to one
> .replace(/(\s(?!(\n|\r))( ?=\s))+/g,"")[/color]

That does work, but will only do so in browsers that support look-ahead
assertions.
[color=blue]
> //take consecutive lines breaks down to one
> .replace(/(\n|\r)+/g,"\n\r")[/color]

That works.
[color=blue]
> //remove spacing at the beginning of a line
> .replace(/(\n|\r)\s/g,"$1")
>
> //remove spacing at the end of a line
> .replace(/\s(\n|\r)/g,"$1");[/color]

These two don't work.

It's clear that you haven't read the group FAQ. I suggest you do.

<URL:http://jibbering.com/faq/>

Mike

--
Michael Winter
M.Winter@blueyo nder.co.invalid (replace ".invalid" with ".uk" to reply)

[Dominique]

Re: trim string in javascript

String.prototyp e.trim = function() {
return this.replace(/(^\s*)|(\s*$)/g, "");
}


and you call it like so:

strVal = strVal.trim()


cheers!


"Jon Kelling" <skater0i@mac.c om> wrote in message
news:a9cb09d3.0 405060648.4d594 bd1@posting.goo gle.com...[color=blue]
> for all your javascript trimming needs...
>
> function trim(inputStrin g) {
> if (typeof inputString != "string") return inputString;
> return inputString
> //clear leading spaces and empty lines
> .replace(/^(\s|\n|\r)*((. |\n|\r)*?)(\s|\ n|\r)*$/g,"$2")
>
> //take consecutive spaces down to one
> .replace(/(\s(?!(\n|\r))( ?=\s))+/g,"")
>
> //take consecutive lines breaks down to one
> .replace(/(\n|\r)+/g,"\n\r")
>
> //remove spacing at the beginning of a line
> .replace(/(\n|\r)\s/g,"$1")
>
> //remove spacing at the end of a line
> .replace(/\s(\n|\r)/g,"$1");
> }
>
> -- Jon[/color]

[Jon Kelling]

Re: trim string in javascript

I wrote my patterns quick under the idea that ^ and $ may match the end
of any line as opposed to the entire string input in some cases. Without
the time at work to dedicate to testing in all cases, I felt it safe to
use (.|\n|\r) in the middle to account for that (rendering the last
group fairly useless, but oh well). The rest of the patterns i wrote
quickly to cleanup any unnecessary data that I don't want to be storing,
worked for me, and thought I would include them on here. If the above
scenario is not a problem for all multiline input strings given
different browsers and especially platforms, it would be cool to have
confirmation on that, otherwise, it works fine for me.

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