diff --git a/test/alphabet b/test/alphabet
index 86e2f3dd..c2cf3ef4 100755
--- a/test/alphabet
+++ b/test/alphabet
@@ -20,7 +20,7 @@ spawnSync('npx', ['webpack', '--mode', 'production', '--output', output, input])
 let js = fs.readFileSync(output).toString()
 fs.unlinkSync(output)
 
-let match = js.match(/[A-Za-z0-9-_]{30,}/)
+let match = js.match(/[\w-]{30,}/)
 if (!match) {
   process.stderr.write(chalk.red('Alphabet was not found\n'))
   process.exit(1)
diff --git a/test/alphabet-genetic b/test/alphabet-genetic
index 2949d711..882845a9 100644
--- a/test/alphabet-genetic
+++ b/test/alphabet-genetic
@@ -19,7 +19,7 @@ spawnSync('npx', ['webpack', '--mode', 'production', '--output', output, input])
 let js = fs.readFileSync(output).toString()
 fs.unlinkSync(output)
 
-let match = js.match(/[A-Za-z0-9-_]{30,}/)
+let match = js.match(/[\w-]{30,}/)
 if (!match) {
   process.stderr.write(chalk.red('Alphabet was not found\n'))
   process.exit(1)
@@ -66,7 +66,7 @@ function addMissingCharacter (str, proto) {
 }
 
 function fitnessFunction (phenotype) {
-  let file = js.replace(/[A-Za-z0-9-_]{30,}/, phenotype.alphabet)
+  let file = js.replace(/[\w-]{30,}/, phenotype.alphabet)
   let size = gzipSize.sync(file)
   console.log(size, phenotype.alphabet)
   return -1 * size
@@ -106,9 +106,9 @@ console.log(
 )
 console.log(chalk.green(
   'Size new string:',
-  gzipSize.sync(js.replace(/[A-Za-z0-9-_]{30,}/, best.alphabet))
+  gzipSize.sync(js.replace(/[\w-]{30,}/, best.alphabet))
 ))
 console.log(chalk.yellow(
   'Size old string:',
-  gzipSize.sync(js.replace(/[A-Za-z0-9-_]{30,}/, firstPhenotype.alphabet)))
+  gzipSize.sync(js.replace(/[\w-]{30,}/, firstPhenotype.alphabet)))
 )
diff --git a/test/benchmark b/test/benchmark
index 152513e6..a489846c 100755
--- a/test/benchmark
+++ b/test/benchmark
@@ -18,8 +18,8 @@ let suite = new benchmark.Suite()
 
 function formatNumber (number) {
   return String(number)
-    .replace(/\d\d\d$/, ',$&')
-    .replace(/^(\d)(\d\d\d)/, '$1,$2')
+    .replace(/\d{3}$/, ',$&')
+    .replace(/^(\d)(\d{3})/, '$1,$2')
 }
 
 suite