Regex Tester

Test a regular expression against sample text and inspect matches.

When to use this tool

Essential for building and debugging regular expressions before using them in code. Developers use it to iteratively test patterns against sample text, verify matches, and fine-tune flags without reloading their application.

How to use

Enter a regex pattern in the Pattern field and optionally select flags (g, i, m, s, u). Type test text in the Test text area. Click "Test" to see all matches highlighted with their positions and capture groups.

Pattern

Test text

Flags

g Global i Case insensitive m Multiline s Dot matches newlines u Unicode

Matches

API Reference

Tier: Free
Endpoint: POST https://d3v.tools/api/v1/tools/regex-tools/regex-tester
Method: POST
Content-Type: application/json

Rate Limits

Unauthenticated: 10 req/min
Free: 30 req/min
Premium: 1000 req/min

Request Body

{
    "input": '\/\\b\\w{4}\\b\/g',
    "options": {
        "pattern": '\/\\b\\w{4}\\b\/g',
        "text": 'Test this text with four word matches.',
        "flags": "g"
    }
}

Sample Request

curl -X POST "https://d3v.tools/api/v1/tools/regex-tools/regex-tester" \
    -H "Content-Type: application/json" \
    -H "Authorization: Bearer YOUR_API_KEY" \
    -d '{"input": '\/\\b\\w{4}\\b\/g', "options": {"pattern": '\/\\b\\w{4}\\b\/g', "text": 'Test this text with four word matches.', "flags": "g"}}'

Sample Response

{
    "success": true,
    "data": {
        "input": '\/\\b\\w{4}\\b\/g',
        "result": {
            "matches": [],
            "count": 6,
            "summary": "6 matches found."
        }
    },
    "meta": {
        "tool": "regex-tester",
        "tier": "free"
    }
}