The first char in a word is omitted from being checked against the 'range' element of the 1st part of this expression. 

The second char is properly checked to see if it's in range 

# Desired safe string to expect
goodString = "f42e6be1-29bf-4f3c-ba58-1ae1d9ca5f88"

# Test string to return False if it's not within reg ex range.
# but still returns a false positive even though the g at the start is outside of a-f range.
badString = "g42e6be1-29bf-4f3c-ba58-1ae1d9ca5f88"

# 2nd test string which does return a false result correctly.
otherBadString = "fg2e6be1-29bf-4f3c-ba58-1ae1d9ca5f88"

See attached file for example.

"Python 2.5.4 (r254:67916, Dec 23 2008, 15:19:34) [MSC v.1400 64 bit (AMD64)] on
win32"