Run results for: Regexp test for finding invalid character

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Includes	20406376.0 Ops/sec
Regexp	1727072.1 Ops/sec

Script Preparation code:

function escapeRegExp(string) {
    return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); // $& means the whole matched string
}

Tests:

Includes
const headerName = '23434łdfwfwfweffwefwefe'; const HTTP_HEADER_NAME_CHARS = '!#$%&*+-.0123456789ABCDEFGHIJKLMNOPQRSTUWVXYZ^_`abcdefghijklmnopqrstuvwxyz|~'; for (const character of headerName) { if (!HTTP_HEADER_NAME_CHARS.includes(character)) { return character; } } return null;
Regexp
const headerName = '23434łdfwfwfweffwefwefe'; const HTTP_HEADER_NAME_CHARS = '!#$%&*+-.0123456789ABCDEFGHIJKLMNOPQRSTUWVXYZ^_`abcdefghijklmnopqrstuvwxyz|~'; const reg = new RegExp('^[' + escapeRegExp(HTTP_HEADER_NAME_CHARS) + ']$'); reg.test(headerName);