Inserting a Space Before a Capital Letter

// October 14th, 2008 // PHP

I needed to insert a space between a camel case string, however, some of the strings contained more than one uppercase letter. I needed to have a regular expression that inserted a space only after an uppercase letter that had a lowercase letter following it. Here is the code:

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//put space after uppercase
$string = preg_replace('/(\w+)([A-Z])/U', '\\1 \\2', $string);
 
//put space before uppercase following lowercase
$string = preg_replace('/([a-z])([A-Z])/', '\\1 \\2', $string);

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