Run results for: Check regex vs substring

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
regex current	644136.8 Ops/sec
subString	2239668.2 Ops/sec
split	583426.5 Ops/sec
regex complex	646120.5 Ops/sec

Script Preparation code:

var IDS = ["report_1", "report_1", "report_1", "report_1","report_1","report_1","report_1","report_1","report_1", "report_dsdsdssds_1", "report_dsdsdsds_1", "report_1", "report_1","report_1","report_1","report_1","report_1","report_1", "report_random_bla_foo_12321312", "report_random_bla_foo_12321312","report_random_bla_foo_12321312","report_random_bla_foo_12321312","report_random_bla_foo_12321312","report_random_bla_foo_12321312","report_random_bla_foo_12321312","report_random_bla_foo_12321312"];

Tests:

regex current
function getCollectionKey(key) { if (!key) { return ''; } return key.replace(/_\w+/g, '_'); } IDS.forEach((id) => getCollectionKey(id));
subString
function getCollectionKey(key) { if (!key) { return ''; } const lastUnderscoreIndex = key.lastIndexOf('_'); if (lastUnderscoreIndex === -1) { return key; } return key.substring(0, lastUnderscoreIndex); } IDS.forEach((id) => getCollectionKey(id));
split
function getCollectionKey(key) { if (!key) { return ''; } const segments = key.split('_'); if (segments.length > 1) { // Remove the last segment if it's a number or string (implies _foo_123 or _bar_) segments.pop(); } // Join the remaining segments back together with underscores return segments.join('_') + (key.endsWith('_') ? '_' : ''); } IDS.forEach((id) => getCollectionKey(id));
regex complex
function getCollectionKey(key) { if (!key) { return ''; } return key.replace(/_[^_]*$/, '_'); } IDS.forEach((id) => getCollectionKey(id));

Run results for: Check regex vs substring

regex current

subString

split

regex complex