Run results for: slice vs capturing group

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

slice

9.2M/s

groups

4.2M/s

View exact numbers

Test name	Executions per second
✓ slice	9,212,910 Ops/sec
groups	4,234,999 Ops/sec

Script Preparation code:

var IMAGE_SIZE_REGEX = /\/s\d{2,3}\//;
var IMAGE_SIZE_REGEX_GROUPS = /(.+)?\/s\d{2,3}\/(.+)?/;

function parseImageUrl(url) {
  const found = url.match(IMAGE_SIZE_REGEX);

  if (!found) {
    return null;
  }
  const { index } = found;
  const sizeStringLength = found[0].length;

  return {
    prefix: url.slice(0, index),
    suffix: url.slice(sizeStringLength + index),
  };
}

function parseImageGroups(url) {
  const found = url.match(IMAGE_SIZE_REGEX_GROUPS);

  if (!found) {
    return null;
  }

  return {
    prefix: found[1],
    suffix: found[2],
  };
}

Tests:

slice
parseImageUrl('prefix/s480/suffix');
groups
parseImageGroups('prefix/s480/suffix');