[llvm] Github Automation: Add support for an optional colon after command name (PR #66540)

[Jon Roelofs via llvm-commits]

================
@@ -572,12 +572,12 @@ def execute_command(self) -> bool:
         """
         This function reads lines from STDIN and executes the first command
         that it finds.  The 2 supported commands are:
-        /cherry-pick commit0 <commit1> <commit2> <...>
-        /branch <owner>/<repo>/<branch>
+        /cherry-pick<:> commit0 <commit1> <commit2> <...>
+        /branch<:> <owner>/<repo>/<branch>
         """
         for line in sys.stdin:
             line.rstrip()
-            m = re.search(r"/([a-z-]+)\s(.+)", line)
+            m = re.search(r"/([a-z-]+)(?::)?\s(.+)", line)
----------------
jroelofs wrote:

How about:

```suggestion
            m = re.search(r"/([a-z-]+):?\s(.+)", line)
```

Then the reader doesn't have to remember the rules for `(?:...)`s

https://github.com/llvm/llvm-project/pull/66540