How can PHP be used to check if a string contains only German letters and numbers before saving it to a database?

To check if a string contains only German letters (a-z, A-Z, ä, Ä, ö, Ö, ü, Ü, ß) and numbers (0-9) before saving it to a database, you can use a regular expression to validate the input. By using preg_match() function with the appropriate regex pattern, you can ensure that the string meets the required criteria before insertion into the database. 

$input = "Your string to be validated";

if(preg_match('/^[a-zA-Z0-9äÄöÖüÜß]+$/u', $input)){
    // String contains only German letters and numbers
    // Proceed with saving to the database
} else {
    // String contains characters other than German letters and numbers
    // Handle the validation error
}

Keywords

PHP string validation German letters regular expressions database input validation

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