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Python Exercises

Python: Match a string that contains only upper and lowercase letters, numbers, and underscores

Python Regular Expression: Exercise-14 with Solution

Write a Python program to match a string that contains only upper and lowercase letters, numbers, and underscores.

Sample Solution:-

Python Code:

import re
def text_match(text):
        patterns = '^[a-zA-Z0-9_]*$'
        if re.search(patterns,  text):
                return 'Found a match!'
        else:
                return('Not matched!')

print(text_match("The quick brown fox jumps over the lazy dog."))
print(text_match("Python_Exercises_1"))

Flowchart:

Flowchart: Regular Expression - Match a string that contains only upper and lowercase letters, numbers, and underscores.

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:

Sample Output:

Not matched!                                                                                                  
Found a match!

Python Code Editor:

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