microclaw/regex
skills/built-in/regex/SKILL.md
Write, explain, test, and debug regular expressions, and build them iteratively against real sample input. Use when users want a regex/pattern to match or extract text, ask why a pattern isn't matching, need to validate emails/URLs/dates/phone numbers, or want to do find-and-replace with capture groups. Triggers on mentions of regex, regular expression, pattern, match, extract, validate, find and replace, 正则, 正则表达式, 匹配, 提取, 替换.
$ install --global
skillsauthnpx skillsauth add microclaw/microclaw regexInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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TrivyContainer and dependency vulnerability scanner
95%
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SemgrepStatic code analysis for vulnerabilities
95%
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mcp-scan (Snyk)Model Context Protocol security validation
95%
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Snyk (dep)Open source security scanning
50%
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Socket.devSupply chain security analysis
50%
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VirusTotalMulti-engine malware detection
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Last scanned: Jun 3, 2026, 3:20 AM13.0s1 file scanned
SKILL.md
- name:
- regex
- description:
- Write, explain, test, and debug regular expressions, and build them iteratively against real sample input. Use when users want a regex/pattern to match or extract text, ask why a pattern isn't matching, need to validate emails/URLs/dates/phone numbers, or want to do find-and-replace with capture groups. Triggers on mentions of regex, regular expression, pattern, match, extract, validate, find and replace, 正则, 正则表达式, 匹配, 提取, 替换.
- license:
- Proprietary. LICENSE.txt has complete terms
- compatibility:
- Requires python3. Works on macOS, Linux, and Windows.
Regex
Never hand-wave a regex — test it against real samples before handing it over. A pattern that "looks right" but fails on the user's actual input is worse than no pattern.
Test a pattern against samples
python3 - <<'PY'
import re
pat = r'\b\d{4}-\d{2}-\d{2}\b'
samples = ["due 2026-05-31 ok", "no date", "2026/05/31 wrong sep"]
for s in samples:
print(repr(s), "->", re.findall(pat, s))
PY
Extract with named groups
python3 - <<'PY'
import re
m = re.search(r'(?P<user>[\w.+-]+)@(?P<domain>[\w.-]+)', "ping [email protected]")
print(m.groupdict() if m else "no match")
PY
Find-and-replace with backreferences
python3 - <<'PY'
import re
print(re.sub(r'(\d{4})-(\d{2})-(\d{2})', r'\3/\2/\1', "2026-05-31")) # -> 31/05/2026
PY
Common building blocks
- Anchors:
^start,$end,\bword boundary. - Classes:
\ddigit,\wword char,\sspace; negate with uppercase\D \W \S. - Quantifiers:
*0+,+1+,?0/1,{m,n}; add?for lazy (.*?). - Groups:
(...)capture,(?:...)non-capture,(?P<name>...)named. - Lookaround:
(?=...),(?!...),(?<=...),(?<!...).
Guidance
- Always show what it matches AND what it deliberately rejects, using the user's samples.
- Prefer explicit, readable patterns over clever unreadable ones; add
re.VERBOSEfor complex patterns and comment them. - Warn about catastrophic backtracking (nested quantifiers like
(a+)+) on untrusted input. - Note the regex flavor if it leaves Python (JS, PCRE, Go/RE2, grep) — escaping and lookbehind support differ.
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