Regex Expression

# Limit the string length between 1 and 10 letters (a-z, A-Z)
^[a-zA-Z]{1,10}$


eg. 
match:       abceddddd
no match:    aaaaaaaaaaa


# Limit the lenght of an arbitrayry pattern
^(?=[\S\s]{1,10}$)[\S\s]*


eg. 
match:       a-$%^&**u1
no match:    a-$%^&**u1aa


# Limit the length of nonwhitespace characters (whitespace may exist among nonwhitespace characters)
^\s*(?:\S\s*){1,10}$


eg. 
match:       2008 ddddd        d
no match:    2008 ddddd        dd


# Limit the number of words
^\W*(?:\w+\b\W*){1,10}$


eg. 
match:       abd dd22dd ddd ddd dd dd dd d1d _d dd
no match:    abd dd22dd ddd ddd dd dd dd d1d _d dd dd
 

import re
if re.match(r"^\W*(?:\w+\b\W*){1,10}$", subject):
	# Successful match at the start of the string
else:
	# Match attempt failed