Please Help With Regular Expression

I have this string

"I love townhouses and townhomes"

how to check with regular expression if townhouses and townhomes are present in that string ??
I try to use this pattern:

(townhouse|townhome)

but it works as townhouse OR townhome ,
how to make it search townhouse AND townhome ?

 

You should be able to do something like this. Will be true if the sentence contains both words, false if not/

$sentence = 'I love townhouses and townhomes';
$exists = preg_match('/^(?=.*\btownhomes)(?=.*\btownhouses)/', $sentence, $res) && isset($res[0]);

PHP:

edit: I realise the question was non-language specific, so the following pattern should answer your original question:

^(?=.*\btownhomes)(?=.*\btownhouses)

Code (markup):