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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36

Browser: Chrome 111

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
regex-short	3954213.0 Ops/sec
upper-short	5058179.0 Ops/sec
lower-short	5161324.5 Ops/sec
regex-long	762779.4 Ops/sec
lower-long	1533983.5 Ops/sec
upper-long	1508668.4 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