diff --git a/libexec/bats-preprocess b/libexec/bats-preprocess
index 3fb039f..d88b2f1 100755
--- a/libexec/bats-preprocess
+++ b/libexec/bats-preprocess
@@ -31,12 +31,12 @@ encode_name() {
 
 tests=()
 index=0
+pattern='^ *@test  *([^ ].*)  *\{ *$'
 
 while IFS= read -r line; do
   let index+=1
-  quoted_name="$(expr "$line" : ' *@test  *\([^ ].*\)  *{ *$' || true)"
-
-  if [ -n "$quoted_name" ]; then
+  if [[ "$line" =~ $pattern ]]; then
+    quoted_name="${BASH_REMATCH[1]}"
     name="$(eval echo "$quoted_name")"
     encoded_name="$(encode_name "$name")"
     tests["${#tests[@]}"]="$encoded_name"