var str = "This is a simple test!";
var needle = "sImPle";
str.toLowerCase().includes(needle.toLowerCase())
new RegExp(needle, 'i').test(str);
FAQ: FAQ
Source code: GitHub/MeasureThat.net
Report issues: MeasureThat.net/Issues
Based on: Benchmark.js
Facebook page: https://www.facebook.com/MeasureThat.Net
Python benchmarks support: Pyodide