Run results for: cycle vs regex

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 YaBrowser/18.2.1.174 Yowser/2.5 Safari/537.36

Browser: Yandex Browser 18

Operating system: Windows

Device Platform: Other

Date tested: 6 years ago

Test name	Executions per second
cycle eng_str	0.0 Ops/sec
cycle rus_str	0.0 Ops/sec
regex eng_str	63.1 Ops/sec
regex rus_str	63.5 Ops/sec

Script Preparation code:

function is_only_eng_letters_and_digits(str) {
            for (let index = 0; index < str.length; index++) {
                const code = str.charCodeAt(index);
                if (!(code >= 65 && code <= 90) && !(code >= 97 && code <= 122) && !(code >= 48 && code <= 57)) {
                    return false;
                }
            }
            return true;
}
var eng_str = "qwerty123";
var rus_str = "qwertyФЫВА123";

Tests:

cycle eng_str
for (let index = 0; index < 100000; index++) { for (let i = 0; i < eng_str.length; i++) { const code = str.charCodeAt(i); if (!(code >= 65 && code <= 90) && !(code >= 97 && code <= 122) && !(code >= 48 && code <= 57)) { break; } } }
cycle rus_str
for (let index = 0; index < 100000; index++) { for (let i = 0; i < eng_str.length; i++) { const code = str.charCodeAt(i); if (!(code >= 65 && code <= 90) && !(code >= 97 && code <= 122) && !(code >= 48 && code <= 57)) { break; } } }
regex eng_str
for (let index = 0; index < 100000; index++) { /^[A-Z0-9]+$/i.test(eng_str); }
regex rus_str
for (let index = 0; index < 100000; index++) { /^[A-Z0-9]+$/i.test(rus_str); }

Run results for: cycle vs regex

cycle eng_str

cycle rus_str

regex eng_str

regex rus_str