I have a string in javascript like `#box2' and I just want the '2' from it.
Tried:
var thestring = $(this).attr('href');
var thenum = thestring.replace( /(^.+)(\w\d+\w)(.+$)/i,'$2');
alert(thenum);
It still returns #box2 in the alert, how can I get it to work?
It needs to accommodate for any length number attached on the end.
For this specific example,
var thenum = thestring.replace( /^\D+/g, ''); // replace all leading non-digits with nothing
in the general case:
thenum = "foo3bar5".match(/\d+/)[0] // "3"
Since this answer gained popularity for some reason, here's a bonus: regex generator.
function getre(str, num) {
if(str === num) return 'nice try';
var res = [/^\D+/g,/\D+$/g,/^\D+|\D+$/g,/\D+/g,/\D.*/g, /.*\D/g,/^\D+|\D.*$/g,/.*\D(?=\d)|\D+$/g];
for(var i = 0; i < res.length; i++)
if(str.replace(res[i], '') === num)
return 'num = str.replace(/' + res[i].source + '/g, "")';
return 'no idea';
};
function update() {
$ = function(x) { return document.getElementById(x) };
var re = getre($('str').value, $('num').value);
$('re').innerHTML = 'Numex speaks: <code>' + re + '</code>';
}
<p>Hi, I'm Numex, the Number Extractor Oracle.
<p>What is your string? <input id="str" value="42abc"></p>
<p>What number do you want to extract? <input id="num" value="42"></p>
<p><button onclick="update()">Insert Coin</button></p>
<p id="re"></p>
"#box2_col3".replace( /^\D+/g, '')
should have shown 2
, not 2_col3
- Shiplu Mokaddim 2012-04-04 01:27
#box2_col3
. But see the regex OP used (\w)(.+$)
)which clearly indicates there are other characters after the number - Shiplu Mokaddim 2012-04-04 01:33
replace
work with leading numbers by using: theString.replace(/^.*\D+/g, '');
, but shiplu.mokadd.im's solution is better - LandonSchropp 2012-04-04 02:35
^
as I think: .replace(/\D+/g, '')
Undefitied 2016-12-13 14:44
You should try the following:
var txt = "#div-name-1234-characteristic:561613213213";
var numb = txt.match(/\d/g);
numb = numb.join("");
alert (numb);
result
1234561613213213
I think this regular expression will serve your purpose:
var num = txt.replace(/[^0-9]/g,'');
Where txt
is your string.
It basically rips off anything that is not a digit.
I think you can achieve the same thing by using this as well :
var num = txt.replace(/\D/g,'');
/[^0-9]/g
+1 for readability. Also used with most of the answers here: https://stackoverflow.com/q/1862130/106623 - Kai Noack 2018-01-12 16:47
Using match function.
var thenum = thestring.match(/\d+$/)[0];
alert(thenum);
Try the following: string.replace(/[^0-9]/g, '');
This will delete all non-digit characters, leaving only digits in the string
function retnum(str) {
var num = str.replace(/[^0-9]/g, '');
return parseInt(num,10);
}
console.log('abca12bc45qw'.replace(/[^0-9]/g, ''));
console.log('#box2'.replace(/[^0-9]/g, ''));
Tried all the combinations cited above with this Code and got it working, was the only one that worked on that string -> (12) 3456-7890
var str="(12) 3456-7890";
str.replace( /\D+/g, '');
Result: "1234567890"
Obs: i know that a string like that will not be on the attr but whatever, the solution is better, because its more complete.
str.match(/\d+/g).map(Number)
it will return an arra - Artem Bernatskyi 2018-11-13 03:05
And this is a snippet which extracts prices with currency and formatting:
var price = "£1,739.12";
parseFloat(price.replace( /[^\d\.]*/g, '')); // 1739.12
you may use great parseInt method
it will convert the leading digits to a number
parseInt("-10px");
// will give you -10
For a string such as #box2
, this should work:
var thenum = thestring.replace(/^.*(\d+).*$/i,'$1');
jsFiddle:
You can use regular expression.
var txt="some text 2";
var numb = txt.match(/\d/g);
alert (numb);
That will alert 2.
With Regular Expressions, how to get numbers from a String, for example:
String myString = "my 2 first gifts were made by my 4 brothers";
myString = myString .replaceAll("\\D+","");
System.out.println("myString : " + myString);
the result of myString
is "24
"
you can see an example of this running code here: http://ideone.com/iOCf5G
You can use Underscore String Library as following
var common="#box"
var href="#box1"
_(href).strRight(common)
result will be : 1
See :https://github.com/epeli/underscore.string
DEMO:
http://jsfiddle.net/abdennour/Vyqtt/
HTML Code :
<p>
<a href="#box1" >img1</a>
<a href="#box2" >img2</a>
<a href="#box3" >img3</a>
<a href="#box4" >img4</a>
</p>
<div style="font-size:30px"></div>
JS Code :
var comm="#box"
$('a').click(function(){
$('div').html(_($(this).attr('href')).strRight(comm))})
if you have suffix as following :
href="box1az"
You can use the next demo :
http://jsfiddle.net/abdennour/Vyqtt/1/
function retrieveNumber(all,prefix,suffix){
var left=_(all).strRight(prefix);
return _(left).strLeft(suffix);
}
Here's a solt. that checks for no data
var someStr = 'abc'; // add 123 to string to see inverse
var thenum = someStr.match(/\d+/);
if (thenum != null )
{
console.log(thenum[0]);
}
else
{
console.log('no number');
}
Use this one-line code to get the first number in a string without getting errors:
var myInt = parseInt(myString.replace(/^[^0-9]+/, ''), 10);
please check below javaScripts, there you can get only number
var txt = "abc1234char5678#!9";
var str = txt.match(/\d+/g, "")+'';
var s = str.split(',').join('');
alert(Number(s));
output : 1234567789
var thestring = $(this).attr('href');
var thenum = parsefloat(thestring);
alert(thenum) - Vivek Shukla 2017-07-03 11:10