Benchmark: Count string occurrence

Script Preparation code:

function regex(s, re) {
  var r = s.match(re);
  if (r) return r.length;
  return 0;
}

function split(s, oc) {
  return s.split(oc).length - 1;
}

function indexOf(s, oc) {
  var i = 0, count = 0;
  while ((i = s.indexOf(oc, i)) >= 0) {
    count++;
    i++;
  }
  return count;
}

Tests:

Use regex
window.result = regex("This is a pen", /is/g);
Use split
window.result = split("This is a pen", "is");
Use indexOf
window.result = indexOf("This is a pen", "is");

Historical Performance Data aggregated from 21 community runs

Desktop Results:

Chrome 14 runs

Use split

14.8M/s

Use indexOf

11.8M/s

Use regex

6.8M/s

Fastest: Use split (2.2x faster)

View exact numbers

✓ Use split: 14,788,142 ops/sec
• Use indexOf: 11,764,123 ops/sec
• Use regex: 6,784,726 ops/sec

Firefox 7 runs

Use indexOf

5.0M/s

Use split

4.2M/s

Use regex

4.1M/s

Fastest: Use indexOf (1.2x faster)

View exact numbers

✓ Use indexOf: 4,966,817 ops/sec
• Use split: 4,219,517 ops/sec
• Use regex: 4,099,195 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Use regex
Use split
Use indexOf

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:146.0) Gecko/20100101 Firefox/146.0

Browser/OS: Firefox 146 on Linux

View result in a separate tab

Use indexOf

2.9M/s

Use split

2.6M/s

Use regex

2.6M/s

View exact numbers

Test name	Executions per second
✓ Use indexOf	2,937,492 Ops/sec
Use split	2,611,738 Ops/sec
Use regex	2,597,235 Ops/sec

Count string occurrence (version: 0)

http://stackoverflow.com/questions/4009756/how-to-count-string-occurrence-in-string http://stackoverflow.com/questions/881085/count-the-number-of-occurences-of-a-character-in-a-string-in-javascript

Comparing performance of: `Use regex vs Use split vs Use indexOf`

Created: 9 years ago by: Registered User

Go to the latest result

Use regex

Use split

Use indexOf

Historical Performance Data aggregated from 21 community runs

Desktop Results:

Chrome 14 runs

Firefox 7 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Count string occurrence (version: 0)

http://stackoverflow.com/questions/4009756/how-to-count-string-occurrence-in-string http://stackoverflow.com/questions/881085/count-the-number-of-occurences-of-a-character-in-a-string-in-javascript

Comparing performance of: Use regex vs Use split vs Use indexOf

Created: 9 years ago by: Registered User

Go to the latest result

Use regex

Use split

Use indexOf

Historical Performance Data aggregated from 21 community runs

Desktop Results:

Chrome 14 runs

Firefox 7 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `Use regex vs Use split vs Use indexOf`