How to Convert CamelCase to Spaced Words Using PHP Regular Expression?

CamelCase Conversion Using PHP Regular Expression

For the task of transforming camelCase words into spaced words, a common programming need, the PHP preg_match function can be employed.

Your Initial Approach

Your initial attempt, detailed in the question, utilized the preg_match function with a regular expression to match blocks of words. However, it retrieved the entire word instead of its components.

Proposed Solution Using preg_split

To achieve the desired separation, a more appropriate function is preg_split. This function operates by splitting a string based on a specified delimiter. Here's how to approach the task using preg_split:

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

The Regular Expression Explained

• (?=): Specifies a lookahead assertion, which checks for a matching substring without actually consuming it.
• [A-Z]: Matches any uppercase letter.
• The combination (?=[A-Z]) matches the position immediately before an uppercase letter, effectively indicating the boundary between words in camelCase.

Sample Output

For the input string:

oneTwoThreeFour

The preg_split function will output the array:

['one', 'Two', 'Three', 'Four']

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