Regex Tester & Validator

Matches a run of exactly 128 characters drawn from letters, digits, underscores, dots, or hyphens, requiring the run to be bounded by non-word characters or the start/end of a line (multiline mode, case-insensitive). This length is typical of SHA-512 hex hashes, making it useful for detecting hashes, long API keys, or other 128-character secrets/tokens in logs or source code.