How do I get the string between the first and last underscore in a given string?

Question

I am trying to get the string between the first and last _ in a given string but is not working for me. Take a look to the following table with examples of input => output:

gbox_asset_locations_list => asset_locations
gbox_company_list => company
gbox_country_states_cities_list => country_states_cities
string_company_1_string => company_1

I have tried the following:

$(function() {
  var str = 'gbox_asset_locations_list';
  var result = str.substring(str.lastIndexOf('_') + 1, str.lastIndexOf('_'));
  
  $('body').append(str + ' => ' + result); 
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>

But is not working since I didn't get the proper output, can any help me to get this working? What I am doing wrong?

Why are you using lastIndexOf() to locate the first underscore? — Frédéric Hamidi
– Frédéric Hamidi, Commented Nov 4, 2016 at 12:56

Wander Nauta · Accepted Answer · 2016-11-04 12:58:58Z

2

Wouldn't it be easier to use a regular expression?

$(function() {
  var str = 'gbox_asset_locations_list';
  var result = str.match(/_(.*)_/)[1];

  $('body').append(str + ' => ' + result); 
});

The regex matches 'first an underscore, then as many characters of any kind as possible, then another underscore'. You then take the 'many characters' as the result.

answered Nov 4, 2016 at 12:58

Wander Nauta

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Cerbrus · Accepted Answer · 2016-11-04 13:00:16Z

2

try that :

var str = 'gbox_asset_locations_list';
var result = str.substring(str.indexOf('_') + 1, str.lastIndexOf('_'));

console.log(result)

edited Nov 4, 2016 at 13:00

Cerbrus

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answered Nov 4, 2016 at 12:56

Léo Fasano

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Pablo Darde · Accepted Answer · 2016-11-04 13:07:51Z

0

(function() {
   var strs = ['gbox_asset_locations_list', 'gbox_company_list', 'gbox_country_states_cities_list', 'string_company_1_string']

   var res = [];
   var _str;

   strs.map(function(item, idx) {
     _str = item.substring(item.indexOf('_')+1, item.lastIndexOf('_'));
     res.push( _str);
     document.querySelector('#results').innerHTML += res[idx] +'<br>';
   }.bind(this));
}())

answered Nov 4, 2016 at 13:07

Pablo Darde

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