python检查字符串是否是盐字符的复合字符串

在@deceze的提示下展开:

def is_build_from_salt_chars_only(token):
    return set(token).issubset(set(SALT_CHARS))

def is_built_from_salt_chars_only(token):
    return all(char in SALT_CHARS for char in token)

如果你的盐字符都是字母数字的,最简单的方法就是 str 功能 .isalnum() :

salt = "adeooAEDjifewOfej23923mklEWE"
non_salt = "\dekoS,"

print(salt.isalnum())
# prints True
print(non_salt.isalnum())
# prints False

SALT_CHARS = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'

salt = "adeooAEDjifewOfej23923mklEWE"
non_salt = "\dekoS,"

# either with sets:
print(set(salt).issubset(set(SALT_CHARS)))
# prints True
print(set(non_salt).issubset(set(SALT_CHARS)))
# prints False

# or with a list comprehension:
print(all([x in SALT_CHARS for x in salt]))
# prints True

print(all([x in SALT_CHARS for x in non_salt]))
# prints False

re绝对是实现这一点的一种方法。请尝试以下操作:

SALT_CHARS = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'

def is_build_from_salt_chars_only(token):
    if re.match('^[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789]+$', token, flags=0):
    return True
else:
    return False

print(is_build_from_salt_chars_only('a8B4'))
print(is_build_from_salt_chars_only('a8#4'))

re.match(r'^\w+$', token, flags=0)

可能有一种聪明而有效的方法:

salt = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
ascii = [ord(i) for i in a]
ascii.sort()
print(ascii)
[48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122]

所以一个快速的方法应该是:

for i in 'ab#4':
    if not 48 <= ord(i) < 57 and not 65 <= ord(i) <= 90 and not 97 <= ord(i) <= 122:
        return False
return True

只有在SALT不变的情况下才起作用,因此可以对值进行共享编码以加快执行时间。

import re
SALT_CHARS = '^[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789]*$'

def salt(tested_string):
    return re.match(SALT_CHARS, tested_string) is not None

.

print(salt('asdf657'))
#returns true
print(salt('asdf6!57'))
#returns false