Run results for: Case-insensitive string comparison: regex -i versus string.toUppercase

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

Browser: Chrome 103

Operating system: Mac OS X 10.14.6

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
regex-short	3368510.5 Ops/sec
upper-short	4419370.5 Ops/sec
lower-short	4376196.5 Ops/sec
regex-long	711258.7 Ops/sec
lower-long	1592620.4 Ops/sec
upper-long	1569950.6 Ops/sec

Tests:

regex-short
const alpha = "Alpha"; const upperAlpha = "ALPHA"; const lowerAlpha = 'alpha'; const regexAlpha = new RegExp(/alpha/i); var output; output = regexAlpha.test(alpha); output = regexAlpha.test(lowerAlpha); output = regexAlpha.test(upperAlpha);
upper-short
const alpha = "Alpha"; const upperAlpha = "ALPHA"; const lowerAlpha = 'alpha'; const regexAlpha = new RegExp(/alpha/i); var output; output = alpha.toUpperCase() === upperAlpha; output = alpha.toUpperCase() === upperAlpha; output = alpha.toUpperCase() === upperAlpha;
lower-short
const alpha = "Alpha"; const upperAlpha = "ALPHA"; const lowerAlpha = 'alpha'; const regexAlpha = new RegExp(/alpha/i); var output; output = alpha.toLowerCase() === lowerAlpha; output = alpha.toLowerCase() === lowerAlpha; output = alpha.toLowerCase() === lowerAlpha;
regex-long
const longString = `The licenses for most software and other practical works are designed to take away your freedom to share and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users. We, the Free Software Foundation, use the GNU General Public License for most of our software; it applies also to any other work released this way by its authors. You can apply it to your programs, too.`; const lowerLongString = longString.toLowerCase(); const upperLongString = longString.toUpperCase(); const regexLong = new RegExp(/The licenses for most software and other practical works are designed to take away your freedom to share and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users. We, the Free Software Foundation, use the GNU General Public License for most of our software; it applies also to any other work released this way by its authors. You can apply it to your programs, too./i); var output; output = regexLong.test(longString); output = regexLong.test(lowerLongString); output = regexLong.test(upperLongString);
lower-long
const longString = `The licenses for most software and other practical works are designed to take away your freedom to share and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users. We, the Free Software Foundation, use the GNU General Public License for most of our software; it applies also to any other work released this way by its authors. You can apply it to your programs, too.`; const lowerLongString = longString.toLowerCase(); const upperLongString = longString.toUpperCase(); const regexLong = new RegExp(/The licenses for most software and other practical works are designed to take away your freedom to share and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users. We, the Free Software Foundation, use the GNU General Public License for most of our software; it applies also to any other work released this way by its authors. You can apply it to your programs, too./i); var output; output = longString.toLowerCase() === lowerLongString; output = longString.toLowerCase() === lowerLongString; output = longString.toLowerCase() === lowerLongString;
upper-long
const longString = `The licenses for most software and other practical works are designed to take away your freedom to share and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users. We, the Free Software Foundation, use the GNU General Public License for most of our software; it applies also to any other work released this way by its authors. You can apply it to your programs, too.`; const lowerLongString = longString.toLowerCase(); const upperLongString = longString.toUpperCase(); const regexLong = new RegExp(/The licenses for most software and other practical works are designed to take away your freedom to share and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users. We, the Free Software Foundation, use the GNU General Public License for most of our software; it applies also to any other work released this way by its authors. You can apply it to your programs, too./i); var output; output = longString.toUpperCase() === upperLongString; output = longString.toUpperCase() === upperLongString; output = longString.toUpperCase() === upperLongString;

Run results for: Case-insensitive string comparison: regex -i versus string.toUppercase

regex-short

upper-short

lower-short

regex-long

lower-long

upper-long