By name: regex-tester description: Test and validate regular expressions with real-time matching, groups extraction, and replace functionality. Inspired by ZeroClaw's pattern matching and OpenClaw's validation tools.
Regex Tester
Test regular expressions with syntax validation, match testing, group extraction, and replacement.
Features
- Validate: Check regex syntax validity
- Test: Match patterns against text
- Groups: Extract capture groups
- Replace: Find and replace with regex
- Explain: Get human-readable pattern explanation
- Flags: Support for common regex flags (global, case-insensitive, multiline, dotall)
Usage
# Test pattern matching
./scripts/regex.js --pattern "hello.*world" --text "hello there world"
# Extract groups
./scripts/regex.js --pattern "(\d{3})-(\d{3})-(\d{4})" --text "555-123-4567" --groups
# Replace text
./scripts/regex.js --pattern "\b(\w+)\b" --text "hello world" --replace "[$1]" --global
# Validate regex syntax (no text needed)
./scripts/regex.js --pattern "[a-z+" --validate
# Explain pattern
./scripts/regex.js --pattern "^(\d+)\.(\d+)\.(\d+)$" --explain
# With flags
./scripts/regex.js --pattern "HELLO" --text "hello" --flags "i" # case-insensitive
Flags
| Flag | Description |
|---|---|
g |
Global (find all matches) |
i |
Case-insensitive |
m |
Multiline (^ and $ match start/end of lines) |
s |
Dotall (dot matches newlines) |
Examples
| Task | Command |
|---|---|
| Email validation | ./scripts/regex.js --pattern "^[\w.-]+@[\w.-]+\.\w+$" --text "test@example.com" |
| Phone extraction | ./scripts/regex.js --pattern "\d{3}-\d{3}-\d{4}" --text "Call 555-123-4567" --global |
| URL matching | ./scripts/regex.js --pattern "https?://[^\s]+" --text "Visit https://example.com" |
| Date parsing | ./scripts/regex.js --pattern "(\d{4})-(\d{2})-(\d{2})" --text "2024-03-15" --groups |
| Code search | ./scripts/regex.js --pattern "function\s+(\w+)" --text "function hello() {}" --flags "g" |
Output Format
Valid match:
{
"valid": true,
"matches": 2,
"results": [
{ "match": "hello world", "index": 0, "groups": [] },
{ "match": "hello universe", "index": 12, "groups": [] }
]
}
No match:
{
"valid": true,
"matches": 0,
"message": "No matches found"
}
Invalid pattern:
{
"valid": false,
"error": "Unterminated character class",
"position": 5
}
Pattern Reference
.- Any character (except newline)\d- Digit (0-9)\w- Word character (letters, digits, underscore)\s- Whitespace[]- Character class[^]- Negated character class*- Zero or more+- One or more?- Zero or one^- Start of string$- End of string()- Capture group