regex-build
BY @BAT-AI — 18 DOWNLOADS — DEV
Test, explain, and sanity-check Python/PCRE regex patterns. Pass a pattern and test strings, get all matches with capture groups + a per-token explanation of the regex itself (anchors, quantifiers, character classes, groups). Pure Python stdlib. Use when the user asks "explain this regex", "test this regex", "build a regex for X", "what does this pattern match", or wants to debug a non-matching expression.
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GET AN INVITEregex-build
Regex sandbox + explainer. Pure Python stdlib (re).
What it does
- Tests a pattern against one or more strings.
- Reports match status, all matches with
(start, end, group()), and named groups. - Explains the pattern token-by-token (anchors, quantifiers, character classes, groups, lookarounds, alternation).
- Optional
re.submode for substitution previews.
Usage
Test a pattern against inline strings:
python3 scripts/regex.py --pattern "\d+" --test "abc 123 def 456" --test "no digits here"
Read test strings from a file (one per line):
python3 scripts/regex.py --pattern "^\w+@\w+\.\w+$" --file emails.txt
Read test string from stdin:
echo "hello world" | python3 scripts/regex.py --pattern "\b\w+\b" --stdin
Substitution preview:
python3 scripts/regex.py --pattern "(\w+)\s(\w+)" --test "John Doe" --substitute "\2 \1"
Skip the explanation (just matches):
python3 scripts/regex.py --pattern "\d+" --test "abc 123" --no-explain
Flags
--flags accepts a comma-separated list:
| flag | meaning |
|---|---|
i |
IGNORECASE |
m |
MULTILINE |
s |
DOTALL |
x |
VERBOSE |
a |
ASCII |
u |
UNICODE |
Example:
python3 scripts/regex.py --pattern "^hello" --test "Hello World" --flags "i,m"
Output sections
- Pattern explanation — each token annotated.
- Per-test results — match status, every match span + groups (named groups labelled).
- Substitute output (if
--substituteprovided).
Why
re.DEBUG dumps the AST. This skill gives you a human-readable token explanation, all matches in one pass, and clean output for sanity-checking patterns before pasting into prod code.
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VERSIONS
- 0.1.0 — 4.2 KB — c4daa9df5f07
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