feat: add multi-engine regex flavour support

engines/php/NOTICE.SQLite-3.51.0.txt

@@ -0,0 +1,20 @@
+SQLite 3.51.0 public-domain notice
+==================================
+
+Source archive: https://sqlite.org/2025/sqlite-autoconf-3510000.tar.gz
+Source archive SHA-256:
+42e26dfdd96aa2e6b1b1be5c88b0887f9959093f650d693cb02eb9c36d146ca5
+Amalgamation source identifier:
+fb2c931ae597f8d00a37574ff67aeed3eced
+
+The exact sqlite3.c amalgamation in that archive states:
+
+The author disclaims copyright to this source code.  In place of
+a legal notice, here is a blessing:
+
+   May you do good and not evil.
+   May you find forgiveness for yourself and forgive others.
+   May you share freely, never taking more than you give.
+
+Authoritative copyright and public-domain status:
+https://sqlite.org/copyright.html