How to check with regex for special letters?

@jerad 

To check for special letters using regular expressions (regex), you can use the following pattern:

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[^a-zA-Z0-9s]

This pattern will match any character that is not a letter (upper or lower case), a number, or a whitespace character.

Here is an example using Python to check for special letters in a string:

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import re

def check_special_letters(text):
    pattern = re.compile(r'[^a-zA-Z0-9s]')
    special_letters = pattern.findall(text)
    
    if special_letters:
        print("Special letters found:", special_letters)
    else:
        print("No special letters found")

text = "Hello, world! This is a test 123."
check_special_letters(text)

In this example, the text "Hello, world! This is a test 123." is checked for special letters using the regex pattern. The function will output the special letters found in the text.