Tutorial 3: Regular Expressions in Python — Using regex metacharacters ‘ ? * + . ’
Till now, we have covered:
Why do we use ‘r’- raw string ?
Tutorial 1- Finding a particular word
Tutorial 2- Finding individual digits or alphabets or other characters
When I started learning coding , I found that concepts are better understood when used in variety of examples. That’s why I am giving many examples for each topic enlisted below. Click on the topic to navigate directly .
1. metacharacter ‘ ? ’ — to match zero or one repetition of the preceding regex pattern
2. metacharacter ‘ * ‘ — to match zero or more repetitions of the preceding regex pattern
3. metacharacter ‘ + ’ — to match 1 or more repetitions of the preceding regex pattern
4. metacharacter ‘ . ‘ (dot) — to match any character except a newline.
1. metacharacter ‘ ? ’
This is used to match zero or one repetition of the preceding regex pattern
2. metacharacter ‘ * ‘
This is used to match zero or more repetitions of the preceding regex pattern
3. metacharacter ‘ + ’
This is used to match 1 or more repetitions of the preceding regex pattern
4. metacharacter ‘ . ‘ (dot)
This is used to match any character except a newline.
Congratulations !! In this tutorial we covered few basic metacharacters used in regex.
This is real fun. Take a deep breathe and move to the next tutorial.
Happy learning !!!
