regex - php regular expression help -

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i have string. there need 1 word. word between space , point. example 

' 'word.

if find many same pattern words, need first word.

as far understand, try :

/\s(\w+)\./  preg_match('/\s(\w+)\./', 'abc. def. ghi.', $m); echo $m[1],"\n";

output:

def

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