Run results for: replace vs split and join

Test name	Executions per second
✓ replace inline regex	397,091 Ops/sec
replace compiled regex var	395,376 Ops/sec
split and join	319,348 Ops/sec

Script Preparation code:

var strIn = '?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it';
var strOut = 'some';
var regex = /that/g;

Run results for: replace vs split and join

replace inline regex

replace compiled regex var

split and join