Category: Developer
· URL: /tools/online-regex-generator-python.html
Options
Privacy: runs locally in your browser. No uploads, no tracking scripts.
How to use
Use this to generate a practical Python regex without guessing escaping or counts.
- Pick From examples (generalize digits/whitespace) or Escape literal (match the exact text).
- Paste input lines (one example per line) into the box.
- Choose options like Flexible counts (e.g.,
\d+) or Exact counts (e.g.,\d{5}), and whether to add ^...$ anchors. - Click Generate, then copy the pattern or the Python snippet.
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Secondary intents covered: Generate a regex that matches one or more example lines, Escape a literal string so it can be matched exactly with regex, Turn runs of digits/whitespace into \d+/\s+ (or exact counts), Add or remove ^ and $ anchors to control whole-string matching, Produce a copyable Python re.compile snippet with selected flags, Quick-check whether the generated pattern matches each input line, Build an alternation pattern to match multiple variants, Understand how common flags change matching behavior
FAQ
Is the generated pattern compatible with Python re?
Yes—output is designed for Python re (e.g., \d, \s, ^...$) and includes a re.compile snippet.
What does “Flexible runs (+)” do?
It turns repeated classes into + (e.g., 12345 → \d+) instead of exact counts like \d{5}.
Why use ^ and $ anchors?
Anchors force the whole line to match. Without them, the regex can match a substring inside a longer string.
How do I match a literal dot, plus, or parentheses?
Use Escape literal mode; it automatically escapes regex metacharacters like ., +, and (/).
Can I generate a single regex from multiple example lines?
Yes—From examples combines lines using alternation: (?:pat1|pat2|...).
Do the flags map to Python flags?
Yes: IGNORECASE → re.IGNORECASE, MULTILINE → re.MULTILINE, DOTALL → re.DOTALL.
Why might the “quick check” differ from Python?
The quick check runs in your browser’s JavaScript regex engine; most basics match Python closely, but some edge behaviors can differ.