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Regular expressions require specific combinations of characters to match patterns in text. Type elements use regular expressions to specify patterns in the text of the intermediate file, so that Requirements Gateway can identify instances of an element.
Expressions may appear complex, but you can simplify the process of writing expressions by first drafting the functionality you require in natural language and then transposing the functionality as regular expression components. You can use the commonly used expressions to get started.
After you develop an expression, you can also use the Expressions pane of the Configuration dialog box to test the expression on an intermediate file to ensure the expression is capturing the correct information.
Regular expression support in Requirements Gateway is provided by the Perl Compatible Regular Expressions (PCRE) library package. Refer to the Copyright page at Legal Information»Copyright on the Contents tab for more information about the license under which the PCRE library package is redistributed.
Refer to the Perl 5 Regular Expression documentation at www.pcre.org for more information about Perl compatible regular expressions.