php - Need to match ALL similar words/phrases using preg_match_all -

php - Need to match ALL similar words/phrases using preg_match_all -

i'm trying create pattern matches all similar words/phrases within string.

for example, need match: "this", "this is", "this it", "that", "that was", "that not".

it matches first occurence of "this", should match all occurences.

i tried anchors , word boundaries, nil seems work.

i tried (simplified):

$content = "this it! not!"; preg_match_all('/(this|this is|this it|that|that was|that not)/i', $content, $results);

which should output:

this this is this it that that was that not

given you're capturing terms you're searching for, might improve utilize foreach loop substr_count see how many times each string occurs.

for example:

class="lang-php prettyprint-override">$haystack = "this it! not! not test!"; $needles = array( "this", "this is", "this it", "that", "that was", "that not"); foreach ($needles $needle) { // substr_count case sensitive, create subject , search lowercase $hits = substr_count(strtolower($haystack), strtolower($needle)); echo "search '$needle' occurs $hits time(s)" . php_eol; }

the above output:

class="lang-none prettyprint-override">search 'this' occurs 2 time(s) search 'this is' occurs 2 time(s) search 'this it' occurs 1 time(s) search 'that' occurs 1 time(s) search 'that was' occurs 1 time(s) search 'that not' occurs 1 time(s)

if substr_count doesn't provide flexibility need can replace preg_match_all , utilize individual $needle values search terms.

php regex web preg-match preg-match-all