Python
What are Regular Expressions with Python
Regular Expressions with Python
Regular Expressions (Regex) are sequences of characters that define a search pattern, often used for string matching and manipulation tasks like:
Validating email addresses or phone numbersSearching for patterns in text
Replacing substrings
Python provides the re module to work with regular expressions.
Common Regex Patterns
| Pattern | Description |
|---|---|
. | Any character except newline |
\d | Digit (0–9) |
\D | Non-digit |
\w | Word character (a–z, A–Z, 0–9, _) |
\W | Non-word character |
\s | Whitespace |
\S | Non-whitespace |
^ | Start of string |
$ | End of string |
[] | Matches any one character inside |
+ | One or more |
* | Zero or more |
? | Zero or one |
{n} | Exactly n times |
{n,} | n or more times |
{n,m} | Between n and m times |
| ` | ` |
() | Group |
