You can compile a regular expression for use in the following way:

```python
import re

r = re.compile("\d\d\d")


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The re library allows the user to perform matches with regular expressions.

https://docs.python.org/3/library/re.html
https://docs.python.org/3/howto/regex.html

re documentation

Here is a non-exhaustive list of recognized special characters when using regular expressions in python. The documentation contains a more complete list of these characters:

- .
- *
- +
- ?
- {x}
- {x, y}
- \
- []
- |
- \d
- \s
- \w

Special Characters

Here is a list of commonly used methods:

- match()
- search()
- findall()
- finditer()

re Methods

re: Compiling a regular expression

https://www.geeksforgeeks.org/python-regex-cheat-sheet/

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