программа для тестирования регулярных выражений, совместимых с Perl (a program for testing Perl-compatible regular expressions.)
THE ALTERNATIVE MATCHING FUNCTION
By default, pcretest uses the standard PCRE matching function,
pcre[16|32]_exec() to match each data line. PCRE also supports an
alternative matching function, pcre[16|32]_dfa_test(), which
operates in a different way, and has some restrictions. The
differences between the two functions are described in the
pcrematching documentation.
If a data line contains the \D escape sequence, or if the command
line contains the -dfa option, the alternative matching function
is used. This function finds all possible matches at a given
point. If, however, the \F escape sequence is present in the data
line, it stops after the first match is found. This is always the
shortest possible match.
