Python regex cheat sheet with examples

regular expressions (regex) in python are a powerful tool for pattern matching and text manipulation. here is a cheat sheet to help you understand and use regex in python:

1. **basic patterns:**
- `\d`: matches any digit.
- `\w`: matches any alphanumeric character.
- `\s`: matches any whitespace character.

2. **quantifiers:**
- `*`: matches 0 or more occurrences.
- `+`: matches 1 or more occurrences.
- `?`: matches 0 or 1 occurrence.
- `{n}`: matches exactly n occurrences.
- `{n,}`: matches n or more occurrences.
- `{n,m}`: matches between n and m occurrences.

3. **anchors:**
- `^`: matches the start of a string.
- `$`: matches the end of a string.
- `\b`: matches a word boundary.

4. **character classes:**
- `[abc]`: matches any character a, b, or c.
- `[^abc]`: matches any character except a, b, or c.
- `[a-z]`: matches any lowercase letter.
- `[a-z]`: matches any uppercase letter.
- `[0-9]`: matches any digit.

5. **grouping and alternation:**
- `(abc)`: groups characters together.
- `a|b`: matches a or b.

6. **escape characters:**
- `\`: escapes a special character.

7. **flags:**

now, let's see an example of using regex in python:

in this example, we import the `re` module, define a pattern to match a phone number, and then search for that pattern in the given text. if a match is found, we print the matched phone number.

you can experiment with different patterns and flags to match various text patterns using regex in python.

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