> > Although fpc has a regexpr unit:
> > http://svn.freepascal.org/svn/fpc/trunk/packages/base/regexpr/regexpr.pp
> > It has many todos, such as adding support for | in the search expression.
> > So this
> > unit doesn't have enough functionality.
>
> While '|' support is to be considered basic regex functionality, what is the
> really expected functionality?
>
> Basic seems to be: |()?*+ (non-UNICODE) support (from wikipedia).
| is not basic afaik. From re_format BSD Manpage:
Obsolete (``basic'') regular expressions differ in several respects. `|'
is an ordinary character and there is no equivalent for its functional-
ity. `+' and `?' are ordinary characters, and their functionality can
be expressed using bounds (`{1,}' or `{0,1}' respectively). Also note
that `x+' in modern REs is equivalent to `xx*'. The delimiters for
bounds are `\{' and `\}', with `{' and `}' by themselves ordinary
characters. The parentheses for nested subexpressions are `\(' and
`\)', with `(' and `)' by themselves ordinary characters. `^' is an
ordinary character except at the beginning of the RE or= the beginning
of a parenthesized subex- pression, `$' is an ordinary character except
at the end of the RE or= the end of a parenthesized subexpression, and
`*' is an ordinary charac- ter if it appears at the beginning of the RE
or the beginning of a paren- thesized subexpression (after a possible
leading `^'). Finally, there is one new type of atom, a back
reference: `\' followed by a non-zero deci- mal digit d matches the
same sequence of characters matched by the dth parenthesized
subexpression (numbering subexpressions by the positions of their
opening parentheses, left to right), so that (e.g.) `\([bc]\)\1'
matches `bb' or `cc' but not `bc'.
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