Python: Match a string that contains only upper and lowercase letters, numbers, and underscores - w3resource
![python tutorial - Python Regular Expression | Regular Expressions in Python | Part 2 - Search, Match and Find All - By Microsoft Award MVP - learn python - python programming - Learn in 30sec | wikitechy python tutorial - Python Regular Expression | Regular Expressions in Python | Part 2 - Search, Match and Find All - By Microsoft Award MVP - learn python - python programming - Learn in 30sec | wikitechy](https://www.wikitechy.com/tutorials/python/img/python-images/python-regex.png)
python tutorial - Python Regular Expression | Regular Expressions in Python | Part 2 - Search, Match and Find All - By Microsoft Award MVP - learn python - python programming - Learn in 30sec | wikitechy
![python - Regex I want to match until certain characters but still be able to match strings if it doesn't have these characters - Stack Overflow python - Regex I want to match until certain characters but still be able to match strings if it doesn't have these characters - Stack Overflow](https://i.stack.imgur.com/rWMar.jpg)