Split sentence, treating comma as group?

[mentalist]

I have a sentence of say English litriture, i'm after splitting it into words, but the commas (and such, :, are to be treat as a word them selves, i.e. so I can know where they are. Full stops / periods can be ignore since previously split on them.

 

$keywords = preg_split("/[\s]+/", $content);

[mentalist]

lol, PREG_SPLIT_DELIM_CAPTURE

 

$s="Dorothy lived in the midst of the great Kansas prairies, with Uncle Henry, who was a farmer, and Aunt Em, who was the farmer's wife";
$k = preg_split("/[\s]+|([,;:]+)/", $s,-1,PREG_SPLIT_DELIM_CAPTURE|PREG_SPLIT_NO_EMPTY);
foreach($k as $e){
	echo "_".$e."_<br />";
}