Don't insert .*? at the beginning of anchored expressions.

benchmarks/base.js

Index: benchmarks/base.js
diff --git a/benchmarks/base.js b/benchmarks/base.js
index 6e1ff8cc705bbc1b6cbe6c7d404b5487bd9526d3..261733208cb3fef5622a6c805f2254c9c46df521 100644
--- a/benchmarks/base.js
+++ b/benchmarks/base.js
@@ -73,7 +73,7 @@ BenchmarkSuite.suites = [];
 // Scores are not comparable across versions. Bump the version if
 // you're making changes that will affect that scores, e.g. if you add
 // a new benchmark or change an existing one.
-BenchmarkSuite.version = '2';
+BenchmarkSuite.version = '3';
 
 
 // To make the benchmark results predictable, we replace Math.random