Quick problem. Extracting numbers from a string.

Question

I need to extract one variable number from a string. The line always looks like this:

javascript:change(5);

with a variable that is 5.
How can I isolate it? Thank you very much in advance.

+2

javascript jquery string split

Patrick beardmore 22 Aug At 22:10

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4 answers

Use regular expressions : -

var test = "javascript:change(5);"
var number = new RegExp("\\d+", "g")
var match = test.match(number);

alert(match);

+1

Gavin gilmour 22 Aug 09 at 22:15

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A simple RegExp can solve this problem:

var inputString = 'javascript:change(5);';
var results = /javascript:change\((\d+)\)/.exec(inputString);
if (results)
{
  alert(results[1]);  // 5
}

Using a part javascript:change

in a match also ensures that if the string is not in the correct format, you don't get a value from the matches.

+1

gnarf 22 Aug 09 at 22:15

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var str = 'javascript:change(5);', result = str.match(/\((\d+)\)/);

if ( result ) {
    alert( result[1] ) 
}

+1

meder omuraliev 22 Aug '09 at 22:18

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karim79 · Accepted Answer · 2009-08-22T22:14:44+0000

Here's one way, assuming the number is always surrounded by parentheses:

var str = 'javascript:change(5);';
var lastBit = str.split('(')[1];
var num = lastBit.split(')')[0];