Using javascript Regexp object to replace a value in url

Question

<script type="text/javascript">
var currstr = "?distance=10&city=Boston&criteria=shoes&size=10";
var selcity = "California"; //This can come from a drop down

var pat = new RegExp([NEEDPATTERN],"gi");
currstr.replace(pat,selcity);
</script>

I need some help replacing city=Boston in currstr with a value user selects from drop down, right now I have hardcoded value in var selcity. I have placed a [NEEDPATTERN] marker for pattern that can be used to achieve this.

Can someone help me with this pattern?

Eric Yin · Accepted Answer · 2012-01-22 18:39:10Z

1

/City=([^&]+)/gi

should do the trick

answered Jan 22, 2012 at 18:39

Eric Yin

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Paul Armstrong · Accepted Answer · 2012-01-22 18:40:42Z

0

Do you want to replace "Boston" specifically, or do you need to just replace the X in city=X?

For boston, you can just use simple substitution... currstr.replace('Boston', selcity)

For replacing X, you can do: currstr.replace(/city=([^&]+)/, selcity);

answered Jan 22, 2012 at 18:40

Paul Armstrong

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1 Comment

user357086 Over a year ago

Awesome!!. This currstr.replace(/city=([^&]+)/, selcity); works. I wanted to replace any X with new value. Thank you all.!!

nachito · Accepted Answer · 2012-01-22 18:48:13Z

0

If it's possible, rather than replacing you should leave city out entirely and tack it on at the end. Then you don't have to deal with regexing which could be more complicated than the current answers if you take into account entities like &:

<script type="text/javascript">
 var currstr = "?distance=10&criteria=shoes&size=10";
 var selcity = "California"; //This can come from a drop down

 currstr += "&city=" + encodeURIComponent(selcity);
</script>

answered Jan 22, 2012 at 18:48

nachito

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