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A regular expression (regex) is a sequence of characters that defines a search pattern. Regular expressions are used for pattern matching in strings — finding, validating, and extracting text that matches a specific pattern. They are part of OCR H446 section 1.4.
| Use case | Example |
|---|---|
| Validation | Check if an email address is in the correct format |
| Searching | Find all phone numbers in a document |
| Extraction | Pull dates out of a block of text |
| Replacement | Replace all instances of "colour" with "color" |
| Lexical analysis | Identify tokens in source code (numbers, identifiers, keywords) |
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