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Python Program to check if String contains only Defined Characters using Regex
When it is required to check if a given string contains specific characters using regular expression, a regular expression pattern is defined, and the string is subjected to follow this pattern.
Example
Below is a demonstration of the same
import re
def check_string(my_string, regex_pattern):
if re.search(regex_pattern, my_string):
print("The string contains the defined characters only")
else:
print("The doesnot string contain the defined characters")
regex_pattern = re.compile('^[Python]+$')
my_string_1 = 'Python'
print("The string is :")
print(my_string_1)
check_string(my_string_1 , regex_pattern)
my_string_2 = 'PythonInterpreter'
print("\nThe string is :")
print(my_string_2)
check_string(my_string_2, regex_pattern)Output
The string is : Python The string contains the defined characters The string is : PythonInterpreter The doesn’t string contain the defined characters
Explanation
The required packages are imported.
A method named ‘check_string’ is defined, and it takes the string and a regular expression as parameters.
The ‘search’ method is called and checked to see if a specific set of characters is present in the string.
Outside the method, the ‘compile’ method is called on the regular expression.
The string is defined and is displayed on the console.
The method is called by passing this string.
The output is displayed on the console.
Updated on: 20-Sep-2021
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