How to get only digit using regex in javascript

Question

I'm trying to get the row for controls that can have ids like the one below (generated by asp.net webform).

id="contentMain__lvTSEntry__tbxMinute_1"

I'm trying to see if I can capture just the digit, so I'm using the below javascript.

if (e.id.indexOf("_tbxMinute") != -1) {                        
    if (parseInt(e.value) > 59) {
       var cid = e.id;
       var patt = '\d+'
       var test = cid.match(patt)
       alert(test)
      }

So far I'm getting null. How do I get digit from the control id?

Thanks for helping

e.id.indexOf("_tbxMinute") or e.id.indexOf("_tbxHour")?

Mario S
– Mario S

2012-12-20 16:11:54 +00:00
Commented Dec 20, 2012 at 16:11 — Mario S
– Mario S, Commented Dec 20, 2012 at 16:11
@Mario, I made a mistake that I just corrected

Richard77
– Richard77

2012-12-20 16:13:58 +00:00
Commented Dec 20, 2012 at 16:13 — Richard77
– Richard77, Commented Dec 20, 2012 at 16:13

Reporter · Accepted Answer · 2012-12-20 16:13:37Z

3

If you change your pattern string from var patt = '\d+' to var patt = '\\d+' it should work (My try at jsfiddle did it)

answered Dec 20, 2012 at 16:13

Reporter

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Comments

Blender · Accepted Answer · 2012-12-20 16:11:44Z

0

You could use something like this:

/contentMain__lvTSEntry__tbxHour_(\d+)/

It captures the digit:

> var regex = /contentMain__lvTSEntry__tbxHour_(\d+)/;
> regex.exec("contentMain__lvTSEntry__tbxHour_1")[1]
"1"

Alternatively, you could just use /(\d+)/ as the entire regex.

answered Dec 20, 2012 at 16:11

Blender

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Comments

Andre Backlund · Accepted Answer · 2012-12-20 16:17:04Z

0

You can use this code to remove any non digit characters

"contentMain__lvTSEntry__tbxHour_1".replace(/\D/g,'')

answered Dec 20, 2012 at 16:17

Andre Backlund

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Rodrigo · Accepted Answer · 2012-12-20 16:17:38Z

0

You can use this function, that returns all numbers in array:

function returnNumbers(string){
    return string.match(/\d+/g);
}

Examples:

> returnNumbers('123asd123')
["123", "123"]

> returnNumbers('contentMain__lvTSEntry__tbxMinute_1')
["1"]

answered Dec 20, 2012 at 16:17

Rodrigo

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Comments

Fábio Perez · Accepted Answer · 2012-12-20 16:30:00Z

0

If you are using patt as a regular expression, you should declare it as a RegExp type:

var patt = /\d+/;

patt instanceof RegExp; // true

var patt = '\d+' implies that patt is d+, because \d is translated to d as \ is an escape character. Then, match will receive d+ instead of \d+ as argument.

edited Dec 20, 2012 at 16:30

answered Dec 20, 2012 at 16:23

Fábio Perez

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