CHAPTER 13

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Regular Expressions

Many ETL applications and processes usually deal with strings or have to parse large amounts of text; it is not unusual to be in a situation where you want to strip some elements from a block of text or to validate that an email address is in a valid format.

Regular expressions provide a flexible, powerful, and efficient method for processing text. The regular expression pattern-matching engine enables you to

  • Parse large amount of texts to find specific character patterns
  • Validate text to ensure that it matches a predefined pattern
  • Extract, edit, or delete text substrings and to add these substrings in a collection ...

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