Goal : JS function to Split a string based on dot(from last) in O(n). There may be n number of ,.(commas or dots) in string.
str = '123.2345.34'expected output 123.2345 and 34Str = '123,23.34.23'expected output 123,23.34 and 23
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1on what basis you are splitting... any logic ?Mritunjay– Mritunjay2015-04-23 13:49:47 +00:00Commented Apr 23, 2015 at 13:49
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dot(.)(last occurrence)Mukesh Kumar– Mukesh Kumar2015-04-23 13:51:06 +00:00Commented Apr 23, 2015 at 13:51
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14 Answers
In order to split a string matching only the last character like described you need to use regex "lookahead".
This simple example works for your case:
var array = '123.2345.34'.split(/\.(?=[^\.]+$)/);
console.log(array);Example with destructuring assignment (Ecmascript 2015)
const input = 'jquery.somePlugin.v1.6.3.js';
const [pluginName, fileExtension] = input.split(/\.(?=[^\.]+$)/);
console.log(pluginName, fileExtension);However using either slice or substring with lastIndexOf also works, and albeit less elegant it's much faster:
var input = 'jquery.somePlugin.v1.6.3.js';
var period = input.lastIndexOf('.');
var pluginName = input.substring(0, period);
var fileExtension = input.substring(period + 1);
console.log(pluginName, fileExtension);
1 Comment
ArtFranco
Life saver! My old solution was only with split, but that won't take into account various '.' in the file name.
var str = "filename.to.split.pdf"
var arr = str.split("."); // Split the string using dot as separator
var lastVal = arr.pop(); // Get last element
var firstVal = arr.join("."); // Re-join the remaining substrings, using dot as separator
console.log(firstVal + " and " + lastVal); //Printing result
Comments
I will try something like bellow
var splitByLastDot = function(text) {
var index = text.lastIndexOf('.');
return [text.slice(0, index), text.slice(index + 1)]
}
console.log(splitByLastDot('123.2345.34'))
console.log(splitByLastDot('123,23.34.23'))
Comments
I came up with this:
var str = '123,23.34.23';
var result = str.replace(/\.([^.]+)$/, ':$1').split(':');
document.getElementById('output').innerHTML = JSON.stringify(result);<div id="output"></div>
Comments
let returnFileIndex = str =>
str.split('.').pop();
1 Comment
party-ring
Could you please add an explanation for your answer? :)
Try this:
var str = '123.2345.34',
arr = str.split('.'),
output = arr.pop();
str = arr.join('.');
2 Comments
Mukesh Kumar
this will give "123.2345"
Tushar
123.2345 in
str and 34 in outputvar test = 'filename.....png';
var lastStr = test.lastIndexOf(".");
var str = test.substring(lastStr + 1);
console.log(str);
Comments
I'm typically using this code and this works fine for me.
Jquery:
var afterDot = value.substr(value.lastIndexOf('_') + 1);
console.log(afterDot);
Javascript:
var myString = 'asd/f/df/xc/asd/test.jpg'
var parts = myString.split('/');
var answer = parts[parts.length - 1];
console.log(answer);
Note: Replace quoted string to your own need
1 Comment
Manngo
You realise that there isn’t any jQuery here, don’t you?
My own version:
var mySplit;
var str1;
var str2;
$(function(){
mySplit = function(myString){
var lastPoint = myString.lastIndexOf(".");
str1 = myString.substring(0, lastPoint);
str2 = myString.substring(lastPoint + 1);
}
mySplit('123,23.34.23');
console.log(str1);
console.log(str2);
});
Working fiddle: https://jsfiddle.net/robertrozas/no01uya0/
Comments
Str = '123,23.34.23';
var a = Str.substring(0, Str.lastIndexOf(".")) //123,23.34
var b = Str.substring(Str.lastIndexOf(".")) //23
Comments
Try this solution. Simple Spilt logic
<script type="text/javascript">
var str = "123,23.34.23";
var str_array = str.split(".");
for (var i=0;i<str_array.length;i++)
{
if (i == (str_array.length-1))
{
alert(str_array[i]);
}
}
</script>
Comments
very very old question, but I believe it always worth another answer ;-)
const s = '123.2345.123456.34';
function splitString(t) {
let a = t.split(/\./);
return [a.slice(0, -1).join('.'), a.pop()];
}
const [first, last] = splitString(s);
console.log(`first: ${first}, last: ${last}`);
Comments
By using the new flat() method with join() and pop() you can do:
Example 1
// expected output 123.2345 and 34
var str = '123.2345.34';
var result = str.split('.');
var last = result.pop();
var rest = result.flat().join('.');
console.log(rest, last);Example 2
// expected output 123,23.34 and 23
var str = '123,23.34.23';
var result = str.split('.');
var last = result.pop();
var rest = result.flat().join('.');
console.log(rest, last);Comments
The simplest way is mentioned below, you will get pdf as the output:
var str = "http://somedomain.com/dir/sd/test.pdf";
var ext = str.split('.')[str.split('.').length-1];
Output: pdf
