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pythonregexstringspecial-characters
user3076097
user3076097

Reputation: 91

Check when string contains only special characters in python

So what I want to do is check if the string contains only special characters. An example should make it clear

Hello -> Valid
Hello?? -> Valid
?? -> Not Valid

Same thing done for all special characters including "."

Upvotes: 5

Views: 14993

Answers (4)

Vicky
Vicky

Reputation: 1

import string

s = input("Enter a string:")

if all(i in string.punctuation for i in s):
    print ("Only special characters")

else:
    print ("Valid")

use the above loop to set boolean events and use it accordingly

Upvotes: 0

Kasravnd
Kasravnd

Reputation: 107297

You can use a costume python function :

>>> import string 
>>> def check(s):
...   return all(i in string.punctuation for i in s)

string.punctuation contain all special characters and you can use all function to check if all of the characters are special!

Upvotes: 5

anubhava
anubhava

Reputation: 785286

You can use this regex with anchors to check if your input contains only non-word (special) characters:

^\W+$

If underscore also to be treated a special character then use:

^[\W_]+$

RegEx Demo

Code:

>>> def spec(s):
        if not re.match(r'^[_\W]+$', s):
            print('Valid')
        else:
            print('Invalid')


>>> spec('Hello')
Valid
>>> spec('Hello??')
Valid
>>> spec('??')
Invalid

Upvotes: 9

Texom512
Texom512

Reputation: 4863

Here's the working code:

import string

def checkString(your_string):
    for let in your_string.lower():
        if let in string.ascii_lowercase:
            return True
    return False

Upvotes: 0

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