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regular expression question


Hi,

I have a span that contains text of the form

var spanHtml = "My Tab Content (7)";

The content is guaranteed to end with a string of the form "(#)" where
"#" is a whole number.  My question is, how would I write a regular
expression that would change the value of #, given another number?
For example, given the above variable, if I had

var newNumber = 15;

I would want the variable spanHtml to contain

"My Tab Content (15)".

Thanks, - Dave

var str1 = 'My Tab Content (7)';
var _regexp = /[0-9]+/;
alert(str1.replace(_regexp, '15'));

I make no claims that this is the best possible solution.  My Regular
Expression knowledge is severely limited.

One small change could be, since you know it is always (#):

var _regexp = /\([0-9]+\)/;
alert(str1.replace(_regexp, '(15)');

Again though, I am sure a regexp guru will along momentarily to suggest
an improvement.

--
-Lost
Remove the extra words to reply by e-mail.  Don't e-mail me.  I am
kidding.  No I am not.

laredotorn@zipmail.com wrote on 16 mei 2007 in comp.lang.javascript:

function doit(s,n) {
  return s.replace(/\(\d+\)$/,'('+n+')')

}

alert(doit("My Tab Content (7)",15))
alert(doit("Blah Blah (12345)",128))

--
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

On May 16, 2:22 pm, "laredotorn@zipmail.com"

<laredotorn@zipmail.com> wrote:
> Hi,

> I have a span that contains text of the form

> var spanHtml = "My Tab Content (7)";

> The content is guaranteed to end with a string of the form "(#)" where
> "#" is a whole number.  My question is, how would I write a regular
> expression that would change the value of #, given another number?
> For example, given the above variable, if I had

var content="My Tab Content (7)"
var regexp=/\d+(?=\)$)/
content=content.replace(regexp,8)

or

var content="My Tab Content (7)"
content=content.slice(0,-2)+8+content.slice(-1))

In comp.lang.javascript message <8P-dneqFHrL179bbnZ2dnUVZ_jadnZ2d@comcas
t.com>, Wed, 16 May 2007 17:07:51, -Lost <maventheextrawo@techie.com>
posted:

>laredotorn@zipmail.com wrote:
>>  I have a span that contains text of the form
>>  var spanHtml = "My Tab Content (7)";
>>  The content is guaranteed to end with a string of the form "(#)"
>>where
>> "#" is a whole number.  My question is, how would I write a regular
>> expression that would change the value of #, given another number?
>> For example, given the above variable, if I had
>>  var newNumber = 15;
>>  I would want the variable spanHtml to contain
>>  "My Tab Content (15)".
>I make no claims that this is the best possible solution.  My Regular
>Expression knowledge is severely limited.

Then why respond?

>One small change could be, since you know it is always (#):
>Again though, I am sure a regexp guru will along momentarily to suggest
>an improvement.

Then why respond so soon?

        spanHtml =  spanHtml.replace(/\d/, 15) ;

If the input may contain multiple digits, change \d to \d+ .
If the input may be signed, precede /d by [+-]? .

It's a good idea to read the newsgroup c.l.j and its FAQ.  See below.

--
 (c) John Stockton, Surrey, UK.  ?@merlyn.demon.co.uk   Turnpike v6.05   IE 6
 news:comp.lang.javascript FAQ <URL:http://www.jibbering.com/faq/index.html>.
 <URL:http://www.merlyn.demon.co.uk/js-index.htm> jscr maths, dates, sources.
 <URL:http://www.merlyn.demon.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.

Dr J R Stockton said the following on 5/17/2007 11:40 AM:

So that people like you can respond and try to needle them? Believe it
or not, a lot of people here post in the hopes of learning. Whether it
is by answering questions or by posting questions.

--
Randy
Chance Favors The Prepared Mind
comp.lang.javascript FAQ - http://jibbering.com/faq/index.html
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/

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