How can I easily add a space between each lowercase and uppercase letter of a string? The trick is that it can only be between lowercase /uppercase, not when you have an uppercase/lowercase.

For example:

camelCase

should become:

camel Case

not:

camel C ase

I've got a solution using preg_match_all and then looping, but there has to be an easier way. Ideas?

    Hmm... what have you tried? This works for me:

    <?php

$strings = array(
	'camelCase',
	'camelcase',
	'sOme worDswhichDon\'tGoTogether'
);

$pattern = '/(.*?[a-z]{1})([A-Z]{1}.*?)/';
$replace = '${1} ${2}';

foreach($strings AS $string)
{
	echo '<strong>Original:</strong> ', $string,
		'<br /><strong>Replaced:</strong>', 
		preg_replace($pattern, $replace, $string),
		'<br />';
}

?>

    Gives this output:

    Original: camelCase
Replaced:camel Case
Original: camelcase
Replaced:camelcase
Original: sOme worDswhichDon'tGoTogether
Replaced:s Ome wor Dswhich Don't Go Together

    That's what you want isn't it?

      Considering the original poster hasn't replied, we aren't sure yet :p

        WOOPS. Hehe. Read Drakla's reply and didn't bother to double check the usernames... :o

          Well, you don't need the loop, since preg_replace() can take a whole array of strings and process all of them.
          An alternative pattern might be

          /(?<=[^A-Z])([A-Z])/
=replace with=> " $1"

            I didn't need a loop, I just needed the regex patterns on how to replace it properly. This works thanks!

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