The Pattern Matching Processor uses the Tcl regular expression engine to identify named entities in input text. To see the named entity types that the Pattern Matching Processor with the shipped regexes file returns, see Language Support of Named Entities. For background information about adding your own regexes, see Accept Regex.
For information on Tcl syntax, see the Tcl re_syntax Manual Page .
REX modifies the regex matcher so that \n in a regex expression matches straight new lines (\n\), carriage returns (\r), or a combination of both (\r\n). Regardless of what is matches, offsets and lengths in the result will match the input document.
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