reddit

“Recently I’ve been trying to figure out exactly how SquirrelFish Extreme (SFX) is kicking our butts so badly on regexp-dna.js, by about 5x on my machine. Numerically, (WebKit Regular Expression Compiler) WREC provides most of that 5x, but there are some weird twists to the story. My main conclusions: WREC indeed makes for a good regex engine, but also, WREC bails out of any regex with parentheses, and regexp-dna.js contains a bug that favors SFX over SpiderMonkey.” source...