World: r3wp

so simple things are good to start with ... we can have harder ones 
once we see how people respond

Seriously though, three charsets and two temporary variables, there's 
got to be a more efficient way.

should non-alpha be non-captitals? (running in head too)

; Sorry, more fixes
capitals: charset [#"A" - #"Z"]
alpha: charset [#"A" - #"Z" #"a" - #"z"]
non-alpha: complement alpha
parse/all/case [any [to alpha [
    a: 5 capitals any capitals b: [non-alpha | end] (

        b: change/part a rejoin ["<strong>" copy/part a b "</strong>"] b
    ) :b |
    some alpha
]] to end]

No, because that would allow words like this: ABCDEFghij

it would collect as long as there are capitals?

and "g" is none

Well, that would be up to Graham. His original description would 
seem to exclude such words.

means all uppercase?

As far as I can tell.

Yeah .. all uppercase ..

because " a: 5 capitals any capitals b:" stops at "g" and friends.

More importantly, it fails at "g" and friends, backtracks and proceeds 
to the next alternate action, some alpha.

Late, but got it. it would enclose "ABCDEF" but should ignore it 
because of the small letters..

Yup. Parse is fun.

You can drop one charset by changing [non-alpha | end] to [alpha 
end skip | end | none] .

would alpha break work?

No, that would break out of the enclosing all loop. The end skip 
will always fail and proceed to the next alternate.

capital: charset {ABCDEFGHIJKLMNOPQRSTUVWXYZ}
latipac: complement capital
rule: [
    any latipac here:
    copy token some capital there:
    (all[ 4 < length? token
        insert :there "</strong>"
        insert :here "<strong>"
        there: skip :there 16
    ])
    :there
]
parse/all/case txt [some rule]

problem is "Aa", thats aword, but notan all-uppcase-word. so it should 
be ignored.

capital: charset {ABCDEFGHIJKLMNOPQRSTUVWXYZ}
latipac:  complement capital
ws: charset { ^/^-}
rule: [
    any latipac here:
    copy token some capital there:
    opt [some ws
        (all[ 4 < length? token
            insert :there "</strong>"
            insert :here  "<strong>"
            there: skip :there 16]
        )
    ]
    :there
]
parse/all/case txt [some rule]

Fails on "aA".

The inserts are a nice touch though.

capital: charset {ABCDEFGHIJKLMNOPQRSTUVWXYZ}
ws: charset { ^/^-}
latipac: difference complement capital ws


sub-rule: [
	some capital there:
	[ws | end]
	(all[ 4 < length? copy/part :here :there
		insert :there "</strong>"
		insert :here  "<strong>"
		there: skip :there 17]
	)
]
rule: [
	any latipac 
	[	some ws here:
		sub-rule
	]|[skip there:]
	:there
]
parse/all/case txt [here: opt sub-rule some rule]

Doesn't take into account punctuation in the ws charset. This would 
fail on "HELLO, WORLD!"

left as an exercise for the reader

:-)

Of course mine doesn't handle words with apostrophes or hyphens in 
them either. Easy fix though, just add ' and - to the capitals charset.

Actually my further spec for this requires the parser to detect spaces 
between capitalised words :)

And do what?

treat the two capitalised words as one so <strong>HELLO DOLLY</strong>

What about "HELLO, DOLLY!" or such?

I think that punctuation is part of a word

For that matter, what about words in quotes?

only if capitalised

So, no difference.

I'll explain the purpose of all this.

A person is writing a text file.  It has headings which are denoted 
by caps, and terminating in ":".

But some headings are two or more words ... with the last terminating 
in ":" only.

Words inside the text, even in caps should not normally be highlighted.

that's the more complete spec.

Anyway, i have a working version now :)

Well, I hope I helped :)

Yep .. thanks all.

replace/all "</strong> <strong>" ""

What is the best description of Parse?  I would like to point some 
people to Parse as an example of the power of Rebol

reichart, I wrote one in the wikibook, don't know if it's useful.

Since you wrote one, do you know of a better one?  This is not a 
reflection on yours, but it is a great way to know what you considered 
the next best thing.

salvation from regular expressions

I may have added some the the rebol wikibook