The SEQ_REGEXP
rule is similar to the
SEQ
rule except the match sequence is taken to be
a regular expression. In addition to the attributes supported by
the SEQ
tag, the
HASH_CHAR
attribute must be specified. It must be set to
the first character that
the regular expression matches. This rules out using regular expressions
which can match more than one character at the start position. The regular expression match cannot span more than one line, either.
Regular expression syntax is described in Appendix E, Regular Expressions.