User Guide › Design › Data Acquisition › Adapters › Regular Expression Syntax › Buffer Operators

Buffer Operators

The following operators are provide for compatibility with the GNU regular expression library, and Perl regular expressions:

• "\`" matches the start of a buffer.
• "\A" matches the start of the buffer.
• "\'" matches the end of a buffer.
• "\z" matches the end of a buffer.
• "\Z" matches the end of a buffer, or possibly one or more new line characters followed by the end of the buffer.

A buffer is considered to consist of the whole sequence passed to the matching algorithms, unless the flags match_not_bob or match_not_eob are set.