vimhelp: Escape regex pattern properly to avoid syntax warning

Author: ychin

vimhelp/vimhelp/vimh2h.py

@@ -361,7 +361,7 @@ def to_html(self, filename, contents):
 
             # Custom MacVim filters
             if filename == "gui_mac.txt":
-                if re.fullmatch("\s*MACVIM REFERENCE MANUAL\s*", line) != None:
+                if re.fullmatch("\\s*MACVIM REFERENCE MANUAL\\s*", line) != None:
                     out.append("<h1><img src=MacVim.png width=64px>\nMacVim Reference Manual</h1>")
                     line = ""