Getting initial number from string

Question

I'm trying to get the initial number value of a string using jQuery/Javascript. Right now, the string I'm getting is:

  2 <a href="user/[email protected] ">view</a>

I'm trying to take this string (which is stored in a variable, and take only the initial number from it. Normally, I would take only the first digit, but I'm want to make this flexible, so the number could be any digits in length (for example, "2" to "20,000,000"), so I know that just taking the first few digits doesn't work.

Does anyone out there have a solution? Thank you for your time!

Could you please rephrase your question, it's pretty hard to understand. — Eric Leroy
– Eric Leroy, Commented Oct 12, 2012 at 13:52

manavo · Accepted Answer · 2012-10-12 13:52:54Z

1

var str = '2 <a href="user/[email protected] ">view</a>';
var parts = str.split(' ');
alert(parts[0]);

answered Oct 12, 2012 at 13:52

manavo

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Comments

Matt Burland · Accepted Answer · 2012-10-12 13:52:47Z

1

Use parseFloat. It'll stop when it meets an non numeric character.

parseFloat(mystring);

answered Oct 12, 2012 at 13:52

Matt Burland

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Michal Klouda · Accepted Answer · 2012-10-12 13:59:04Z

0

One of the solutions is using regex ^\d+ if you want to grab just digits, or ^[\d,]+ if you allow commas:

var input = '2 <a href="user/[email protected] ">view</a>';
var number = input.match(/^\d+/g);

edited Oct 12, 2012 at 13:59

answered Oct 12, 2012 at 13:52

Michal Klouda

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nbrooks · Accepted Answer · 2012-10-12 14:05:40Z

0

function getNum ( str ) {
    var result = '';
    var nums = str.match(/^(\d+|\,)*/);
    if(nums[0])
        result = parseFloat(nums[0].replace(/,/g,''));

    return result;
}

Usage:

getNum ('2 <a href="user/[email protected] ">view</a>')
Ouput: 2

getNum ('20,000,000 <a href="user/[email protected] ">view</a>')
Output: 20000000

edited Oct 12, 2012 at 14:05

answered Oct 12, 2012 at 13:59

nbrooks

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Xophmeister · Accepted Answer · 2012-10-12 14:06:14Z

0

If the number isn't comma-delimited:

var s   = '1234 <a href="user/[email protected] ">view</a>',
    num = parseInt(s, 10);

If the number is comma-delimited:

var s   = '1,234 <a href="user/[email protected] ">view</a>',
    num = parseInt(s.match(/^\d{1,3}(?:,\d{3})*/)[0].replace(/,/g, ''), 10);

edited Oct 12, 2012 at 14:06

answered Oct 12, 2012 at 13:58

Xophmeister

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Billy Moon · Accepted Answer · 2012-10-13 05:33:51Z

0

If there could be commas in the number, and maybe a dot for decimals, and there is always a space afterwards, I would match using a regex like this...

var str = '2,000.33 <a href="user/[email protected] ">view</a>'
var bits = str.match(/^[\d,\.]+/)

// alerts 2,000.33
alert(bits[0])

// to convert to string...
num = parseFloat(bits[0].replace(/,/g,''))

alert(num)
// alerts: 2000.33 (treated as number, not as string representation of number)

edited Oct 13, 2012 at 5:33

answered Oct 12, 2012 at 13:57

Billy Moon

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1 Comment

Xophmeister Over a year ago

parseInt('2,000.33') is equal to 2

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