๐งฉ Python Regex Tutorial with Examples
Regular expressions (regex) in Python use the re module to search, match, and manipulate strings with powerful pattern rules.
๐ก Quick Tip:
Use raw strings (r'...') for regex patterns to avoid Python's own backslash interpretation conflicts.
๐ป Code Example:
import re # 1. re.search() โ find pattern anywhere in string text = "Pynfinity was founded by santoshtvk in 2024" match = re.search(r'\d{4}', text) print(match.group()) # 2024 # 2. re.findall() โ get ALL matches as a list emails = "contact: admin@pynfinity.com, tvk@gmail.com" found = re.findall(r'[\w.]+@[\w.]+', emails) print(found) # ['admin@pynfinity.com', 'tvk@gmail.com'] # 3. re.sub() โ replace matches cleaned = re.sub(r'\s+', ' ', "too many spaces") print(cleaned) # 'too many spaces' # 4. re.match() โ match at start of string only result = re.match(r'^Pynfinity', text) print(bool(result)) # True # 5. Groups โ extract specific parts url = "https://pynfinity.com/pebbles/python-regex" pattern = r'https?://(\S+)/(\S+)/(\S+)' m = re.search(pattern, url) if m: print(m.group(1), m.group(2), m.group(3))
| Concept | Key Takeaway |
|---|---|
| re.match() | Match at the START of string only |
| re.search() | Match ANYWHERE in string โ returns first match |
| re.findall() | Returns ALL matches as a list |
| re.sub() | Replace matches with a new string |
| re.compile() | Pre-compile a pattern for reuse (faster in loops) |
Keep exploring and happy coding! ๐
