[PHP] RegExp (preg) - how to split long string to length,without cutting words

[moondog]

Hi,
I am a RegExp newbie, and need help with this:
i have a long string (500 / 600 chars), and need to split it in lines.
Each line has a maximum length (20), and words in the line shouldn't be
 cut, instead the line should end at the end of the word whose last
char position is <= 20.
the effect is like a left align in a word processor, where lines wrap at
20, and the words are not cut.
example:

string= "aaaaa bbbbb ccccc ddddd eeeee ffffffffff ggggg"
(char)            1111111111222222222233333333334444444
         1234567890123456789012345678901234567890123456
regexp should output:

"aaaaa bbbbb ccccc
 ddddd eeeee
 ffffffffff ggggg"
Is it a sensible thing to do this job with regExp or is it better to use
 the usual string functions?
Thanx

moondog

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