What are the potential pitfalls of using RegEx to validate numbers in PHP?

One potential pitfall of using RegEx to validate numbers in PHP is that it may not account for all possible number formats, such as numbers with commas or decimals. To solve this issue, it is recommended to use PHP's built-in functions like is_numeric() or filter_var() with the FILTER_VALIDATE_FLOAT or FILTER_VALIDATE_INT flags for more accurate number validation. 

// Using PHP's built-in functions for number validation
$number = "123.45";

if (is_numeric($number)) {
    echo "Valid number";
} else {
    echo "Invalid number";
}

Keywords

RegEx validation numbers PHP pitfalls

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