Question

How to check if a string contains only letters, numbers, underscores and dashes in Python

Answer 1

import re

string = "_Python3-C17-CPP20"

result = bool(re.match("^[A-Za-z0-9_-]*$", string))

print(result)



'''
run:

True

'''

 

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Answer 2

relevant_chars = set('0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-')

string = "_Python3-C17-CPP20"

st = set(string)

if st.issubset(relevant_chars):
   print(True)
else:
   print(False)



'''
run:

True

'''

 

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Answer 3

import re

s1 = "-abc_123-"
if re.match("^[A-Za-z0-9_-]*$", s1):
    print("yes")
else:
    print("no")
    

s2 = "-abc_123-(!)"
if re.match("^[A-Za-z0-9_-]*$", s2):
    print("yes")
else:
    print("no")
    


'''
run:
 
yes
no
 
'''

 

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