Simple regex newbie query

I am using regex in php to parse an RSS feed looking for
certain
keywords. The script works well except that when I am trying
to get a
positive on the word "train" (which works) I
also get a false positive
on the word "training" - but only if it is at
the start of an RSS item.

$keywords = array("rail", "railway",
"railways", "train",
"trains",
"level crossing", "tube",
"bond underground", "railtrack",
"eurostar");

# create regular expression  in format
"^rail|[[:space:]]rail[[:space:]]|rail$"
# this means any line beginning with rail OR any line with
rail with
space either side OR any line ending with rail - or does it?

$keyString = "^" . $keywords[$counter] .
"|[[:space:]]" .
$keywords[$counter] . "[[:space:]]|" .
$keywords[$counter] . "$";
if(eregi($keyString, $title) || eregi($keyString,
$description)) {
# do stuff

Thanks in advance

Gaz


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