Скачать или смотреть Python regex cheat sheet with examples

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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:*
`re.ignorecase`: ignores case when matching.
`re.multiline`: allows matching across multiple lines.

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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