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Regexes and parsers, tested against your real samples.
Describe what you need to match and paste a few real samples — RegexSmith returns a pattern, an explanation of every group, and a test table showing exactly which of your samples match and why. It flags catastrophic-backtracking risks and suggests a parser when a regex is the wrong tool.
Cheap, fast, and single-purpose. This is the agent you keep on usage billing and call twelve times a year.
RegexSmith shows its cost before every run and covers you with a hard cap — or run free under an active time pass.