preg_replace \\1 yIKES!

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Wow this is hard I can't wait till I get the hang of it.

Capitalize the first letter of a word.

echo preg_replace('/(^)(.)(.*$)/', strtoupper('\\2') . '\\3', 'yikes!');
// outputs yikes!

Nope didn't work.

So I want to see if I'm in the right place:

echo preg_replace('/(^)(.)(.*$)/', '\\1' . '-' . strtoupper('\\2') . '-' . '\\3', 'yikes!');
//outputs -y-ikes!

So yea I've got it surrounded why now strtoupper: Yikes!

Thanks

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