How can I check if a string contains only printable characters and whitespace in Python using regular expressions?
Gable E

To check if a string contains only printable characters and whitespace in Python using regular expressions, you can follow these steps: 1. Import the necessary module: - Import there module, which provides functions for working with regular expressions. - Example:

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import re

2. Check the string: - Use there.match() function to check if the string matches the desired pattern. - The patternr'^[ -~]+$' matches a string that contains only printable ASCII characters and whitespace. - The pattern uses a character class[ -~] to match any character in the ASCII range from space (32) to tilde (126), which represents all printable characters. - The+ quantifier ensures that one or more such characters are present in the string. - The^ and$ anchors ensure that the entire string matches the pattern, from start to end. - If the string matches the pattern,re.match() will return a match object; otherwise, it will returnNone. - Use a conditional expression to check the result ofre.match() againstNone. - Example:

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def contains_only_printable_and_whitespace(string):
    return re.match(r'^[ -~]+$', string) is not None

3. Use the function: - Call thecontains_only_printable_and_whitespace() function and pass the string you want to validate. - It will returnTrue if the string contains only printable characters and whitespace, andFalse otherwise. - Example:

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string = "Hello, World!"
if contains_only_printable_and_whitespace(string):
    print("Valid string")
else:
    print("Invalid string")

By using regular expressions with there.match() function and a pattern that matches printable characters and whitespace, you can efficiently check if a string contains only printable characters and whitespace. Regular expressions provide a powerful and flexible way to validate the format and content of the string based on the specified pattern.

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