fix file encoding detection with python2.x (closes #70494)

file encoding declaration shall be in a magic *comment*.

from PEP0263::

  More precisely, the first or second line must match the regular
  expression "coding[:=]\s*([-\w.]+)". The first group of this
  expression is then interpreted as encoding name. If the encoding
  is unknown to Python, an error is raised during compilation. There
  must not be any Python statement on the line that contains the
  encoding declaration.

1 files changed, 1 insertions, 1 deletions

diff --git a/builder.py b/builder.py
index 799cc7e7..68bd5c30 100644
--- a/builder.py
+++ b/builder.py
@@ -60,7 +60,7 @@ if sys.version_info >= (3, 0):
 else:
     import re
 
-    _ENCODING_RGX = re.compile("[^#]*#*.*coding[:=]\s*([^\s]+)")
+    _ENCODING_RGX = re.compile("\s*#+.*coding[:=]\s*([-\w.]+)")
 
     def _guess_encoding(string):
         """get encoding from a python file as string or return None if not found