Run results for: RegExp.exec 1k vs 10k vs 100k character string

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.36

Browser: Chrome 101

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
1k length string	2894929.0 Ops/sec
10k length string	522865.0 Ops/sec
100k length string	72698.5 Ops/sec

Script Preparation code:

var regex = /Goodbye (World)/;
var smallStr = '';
var medStr = '';
var largeStr = '';

for (var i = 0; i < 5000; i++) {
  if (i % 100 === 0) smallStr += 'Small World! ' + Math.floor(Math.random() * 8);
  if (i % 10 === 0) medStr += 'Medium World! ' + Math.floor(Math.random() * 6);
  largeStr += 'Large World! ' + Math.floor(Math.random() * 7);
}

Tests:

1k length string
regex.exec(smallStr);
10k length string
regex.exec(medStr);
100k length string
regex.exec(largeStr);

Run results for: RegExp.exec 1k vs 10k vs 100k character string

Testing exec (not found) times for different string lengths

1k length string

10k length string

100k length string