[utils] Python utils script extract_vplan.py to extract VPlan digraphs regexp fix

[Kazhuu]

Summary

Regarding this bug in Bugzilla: https://bugs.llvm.org/show_bug.cgi?id=46451

I went ahead and fixed the regexp pattern and now Python script is able to extract vplan graphs from the log files. Additionally some test for this would be nice to have but I'm not sure are Python scripts tested in LLVM and if so where they live.

[fhahn]

LGTM thanks, the , was indeed dropped.

[Kazhuu]

I need someone else to commit this patch for me. Commit can be made with name Mauri Mustonen and email [e-mail].

llvm/utils/extract_vplan.py

 dot = shutil.which('dot')
 if args.png and not dot:
     raise RuntimeError("Can't export to PNG without 'dot' in the system")
 
 pattern = re.compile(r"(digraph VPlan {.*?\n})",re.DOTALL)
 matches = re.findall(pattern, sys.stdin.read())
 
 for vplan in matches:
-    m = re.search("graph \[.+(VF=.+,UF.+), ", vplan)
+    m = re.search("graph \[.+(VF=.+,UF.+)", vplan)
     if not m:
         raise ValueError("Can't get the right VPlan name")
     name = re.sub('[^a-zA-Z0-9]', '', m.group(1))
 
     if args.png:
         filename = 'VPlan' + name + '.png'
         print("Exporting " + name + " to PNG via dot: " + filename)
         p = subprocess.Popen([dot, '-Tpng', '-o', filename],