User Guide › Design › Data Acquisition › Adapters › Regular Expression Syntax › Forward Lookahead Asserts

Forward Lookahead Asserts

There are two forms of these; one for positive forward lookahead asserts, and one for negative lookahead asserts:

• "(?=abc)" matches zero characters only if they are followed by the expression "abc".
• "(?!abc)" matches zero characters only if they are not followed by the expression "abc".