Rename regex_t to parse_tree_t and merge module into parser

scripts/build.sh

@@ -8,8 +8,7 @@ mkdir -p build
 
 # Build library
 clang $CFLAGS -Ilib -c lib/parser.c -o build/parser.o
-clang $CFLAGS -Ilib -c lib/regex.c -o build/regex.o
-ar -crs build/lib.a build/parser.o build/regex.o
+ar -crs build/lib.a build/parser.o
 
 # Build tests
 clang $CFLAGS -Itests -c tests/testing.c -o build/testing.o