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Answer 1

+2 A:

I wouldn't use regular expressions for this, it's extra overhead and complexity where a regular string function would suffice. Why not go with stripos() instead?

$str = 'client';
$terms = array('cli','ent','cl');
foreach($terms as $t) {
    if (stripos($str,$t) !== false) {
        echo "$t exists in $str";
        break;
    }
}

zombat 2010-01-29 06:09:13

Don't forget `strstr()`

alex 2010-01-29 06:11:18

`strpos()/stripos()` are faster and more memory efficient than `strstr()/stristr()` if you just need to know whether a given substring exists.

zombat 2010-01-29 06:15:15

echo stripos('client',$filterstr); it is showing 0 as result. when my search keyword ='cli'

Krishna Priya 2010-01-29 06:16:17

Yes. If you read the documentation for `stripos()` you'll see that if returns the position index of the substring match, not the substring itself. If you want to output which term matched, just `echo $filterstring`. You didn't mention what kind of output you wanted in your function, just that you wanted to match a substring, so I assumed you were just looking for a true/false match.

zombat 2010-01-29 06:19:10

Thanks for ur help and quick reply. I got the results using that function. Thanks again.$pos1 = stripos("client", $filterstr);if ($pos1 !== false)$flag=1;return $flag;

Krishna Priya 2010-01-29 06:23:43

I agree, but `stripos` as oppsed to `strpos` gets slower the longer the strings become up to the extent where Regex *may* be faster. See a similar question and my benchmarks at http://stackoverflow.com/questions/1962031/how-to-check-if-a-string-starts-with-in-php/1962244#1962244

Gordon 2010-01-29 08:32:06

Answer 2

A:

Try the pattern /cli?|ent/

Explanation:

cli matches the first part. The i? makes the i optional in the search.

| means or, and that matches cli, or ent.

CodeJoust 2010-01-29 06:10:02

Answer 3

A:

\b is word boundary, It would not match cli in client, you need to remove \b

S.Mark 2010-01-29 06:10:15

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