How to Split CamelCase Words into Individual Words in PHP Using Regular Expressions?

Splitting CamelCase Words into Words Using PHP preg_match

When working with CamelCase notation, it may be necessary to split the string into individual words. This can be achieved using the preg_match function in PHP.

To split the example word "oneTwoThreeFour", we can utilize the following regular expression:

$words = preg_match("/[a-zA-Z]*(?:[a-z][a-zA-Z]*[A-Z]|[A-Z][a-zA-Z]*[a-z])[a-zA-Z]*\b/", $string, $matches);

However, as you have noted, this expression simply returns the entire word.

Instead, we can use a different approach with preg_split:

<code class="php">$arr = preg_split('/(?=[A-Z])/',$str);</code>

This expression uses a positive lookahead (?=) to identify the position just before an uppercase letter. By splitting the input string at these points, we obtain the desired result:

["one", "Two", "Three", "Four"]

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