preg_match not working

[dinesh1985singh]

Hello everyone,

I am trying to use preg_match for replacing a string.
I am using following code

$regExp = "/^[i]$/";
$match = "hii this";
$result = preg_replace($regExp,"s",$match);
echo $result ; // results into hii this

The preg_replace is not replacing the matching character.
But if i use $regExp = "/[i]/"; instead of $regExp = "/^[i]$/";
it works ,Can I get the reason behind this .I guess the
$regExp = "/^[i]$/"; should also be work.The caret(^) and the dollar($) just specify the start and end of the regular expression.


Thanks

[dgreenhouse]

This '$regExp = "/^[i]$/";' is telling the regex to match the character class [i] at the beginning and end of the subject string only. And this '$regExp = "/[i]/";' is telling it to match anywhere in the subject string.

[dinesh1985singh]

Thank you dgreenhouse for your quick reply. I get the thing now.
Thank you