How to find the index of all the occurrences of string in javascript?

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Using indexOf function we can find the index of particular string. How to get the index of all the occurrences of string.Is there any simplest way to do it?

Posted 7-Sep-14 23:06pm

Vidhya Raju

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2 solutions

Solution 1

Tty

string myString= "Check occurrences within this string.";
int count = myString.match(/in/g);// Search for 'in' occurrences in string

Posted 7-Sep-14 23:15pm

Abhinav S

Updated 7-Sep-14 23:17pm

v4

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Vidhya Raju 8-Sep-14 5:23am

Thanks for the answer. Actually I need to select all the occurences of searched string.The following code does that except its not jumping to the location where the string is selected. Can you tell me how to do this?

<textarea type="text" id="input_tag">This is the testing</textarea>

<script>
(function() {
if (!HTMLInputElement.prototype.setSelectionRange) {
HTMLInputElement.prototype.setSelectionRange = function(start, end) {
if (this.createTextRange) {
var range = this.createTextRange();
this.collapse(true);
this.moveEnd('character', start);
this.moveStart('character', end);
this.select();
}
}
}
})();
var search="testing";
var regexp = /testing/g;
var foo = document.getElementById("input_tag").value;
var match, matches = [];

while ((match = regexp.exec(foo)) != null) {
document.getElementById("input_tag").setSelectionRange(match.index,(match.index)+(search.length));

}
</script>

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OriginalGriff · Accepted Answer · 2014-09-07T23:17:00

Solution 2

Use a regex:

C#

var regex = /,/g;
var instr = "1,2,3,4";
var current;
var matchIndexes = [];

while ((current = regex.exec(instr)) != null)
{
   matchIndexes.push(current.index);
}

Posted 7-Sep-14 23:17pm

OriginalGriff

Comments

Vidhya Raju 8-Sep-14 6:47am

var regex ="/" + "document.getElementById(id).value" + "/g";

If I parse the value to regex like above. Its not working. How to parse the variable into regex?

OriginalGriff 8-Sep-14 6:57am

:sigh:
I think you need to go back to your notes and start again with what "var" means...
var regex = new RegExp(document.getElementById(id).value, "g");