add 'regex' to features matrix

Author: trappitsch

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        FEATURES: ['', 'from_str', 'std', 'serde']
+        FEATURES: ['', 'from_str', 'std', 'serde', 'regex']
         TARGET: ['x86_64-unknown-linux-gnu']
 
         include:
@@ -70,7 +70,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        FEATURES: ['', 'from_str', 'std', 'serde']
+        FEATURES: ['', 'from_str', 'std', 'serde', 'regex']
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable