Python 正则表达式限定文本长度

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
^(?=[Ss]{1,10}$)[Ss]*


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


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


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


# Limit the number of words
^W*(?:w+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+W*){1,10}$", subject):
	# Successful match at the start of the string
else:
	# Match attempt failed