Python re Module
Practical regular expressions with compiled patterns and groups.
- python re
- re.compile
- findall
- named groups
- regex sub
Python re Module
Practical regular expressions with compiled patterns and groups.
Commands
| Command | What it does |
|---|---|
re.compile(r"\d{4}-\d{2}-\d{2}") | Compile once, reuse |
pattern.search(text) | First match anywhere |
pattern.findall(text) | All matches |
pattern.sub("X", text) | Replace matches |
re.split(r"\s*,\s*", s) | Split on comma + spaces |
Example
import re
pat = re.compile(r"(?P<year>\d{4})-(?P<month>\d{2})")
m = pat.search("release 2026-10")
print(m.groupdict()) # {'year': '2026', 'month': '10'}FAQ
search vs match?
search scans the whole string; match anchors at the start — most bugs come from using match unintentionally.
Why raw strings?
Backslashes stay literal (r"\d" not "\\d"); always write patterns as r"...".
SSS
search vs match?
search scans the whole string; match anchors at the start — most bugs come from using match unintentionally.
Why raw strings?
Backslashes stay literal (r"\d" not "\\d"); always write patterns as r"...".
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