> -----Original Message-----
> From: Joel
> Subject: Re: [Spirit-general] RE: [Spirit-devel] More Quickbook updates
>
> David Barrett wrote:
> > Yes, it's a nasty problem. Here is the regular expression I use for
> bold:
> >
> '/(?<=^|^\W|\s\W|\s|<b>|<i>|<code>)\*(([^*\s]+\s+)*[^*\s]+)\*(?=<\/b>|<\/i
> >|<\/code>|\s|\W\s|\W$|$)/i'
> >
>
> Now, before giving me a headache (I always get one when reading
> regexes-- certainly one of the reasons why I wrote Spirit), how
> do you translate that in simple english?
So, you want *me* to get the headache while translating... :)
Even better than English, I'll try to convert to pseudo-Spirit
String bold;
Rule<> sol = start of line;
Rule<> nonwordchar = ~(chset_p[a-zA-Z0-9_]);
Rule<> prefix = ( sol | (sol >> nonword) | (+space_p >> nonword) | space_p |
"<b>" | "<i>" | "<code>" )
Rule<> wordchar = ~( '*' | space_p );
Rule<> boldtext = (( +wordchar >> +space_p ) >> +wordchar)[ assign_a(bold)]
Rule<> postfix = ( "</b>" | "</i>" | "</code>" | space_p |
nonword >> space_p | nonword >> eol_p | eol_p );
Rule<> match = prefix >> '*' >> boldtext >> '*' >> postfix;
Or something like that. Basically, so long as it's surrounded by:
1) Bold, italics, or code HTML tags
2) Whitespace
3) Start/end of line
4) Exactly one non-word character, surrounded by space
5) Exactly one non-word character, surrounded by start/end of line
The reason for rules 4, and 5 is to allow shorthand notations to combine.
So, for example, you can do /*bold italics*/ or /#italics code#/ and so
forth. The reason for rule 1 is to accommodate previous passes of the
pattern (it can be applied multiple times).
I hope that made sense. I'm not sure how well it translates into a one-pass
parser.
-david
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