What common mistake did the user make when using preg_grep in PHP, and how was it resolved?

The user mistakenly used the preg_grep function without providing the correct regular expression pattern to match against. To resolve this issue, the user needs to include the regular expression pattern as the first argument in the preg_grep function call. 

// Incorrect usage of preg_grep
$matches = preg_grep('/pattern_to_match/', $array);

// Corrected usage of preg_grep
$matches = preg_grep('/pattern_to_match/', $array);

Keywords

preg_grep PHP regular expressions syntax error resolution

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