Regex Tester API MCP Server

Use this when you need to test a regular expression against one or more strings. Returns all matches, capture groups, positions, and a human-readable explanation of the pattern. 1. pattern -- the regex pattern tested 2. flags -- flags applied (g, i, m, s, u) 3. explanation -- plain-English description of what the pattern matches 4. results -- array of test results per string, each with: matched (boolean), matches (array with value, index, groups) 5. totalMatches -- total match count across all test strings Example output: {"pattern":"\d{3}-\d{4}","flags":"g","explanation":"Matches 3 digits, a hyphen, then 4 digits","results":[{"input":"Call 555-1234","matched":true,"matches":[{"value":"555-1234","index":5,"groups":[]}]}],"totalMatches":1} Use this FOR validating regex patterns before deploying them in code, debugging why a pattern fails to match, or extracting structured data from text. Use this BEFORE writing complex regex into production code. Do NOT use for text classification -- use text_classify_content instead. Do NOT use for PII detection -- use privacy_detect_pii instead. Do NOT use for text comparison -- use text_compare_diff instead.