PHP matches 6 to 16 character combinations (only numbers, letters, underscores)

This article describes a method that uses PHP to match 6-bit, 16-bit character combinations, which require only numbers, letters, and underscores. Refer to a friend who needs it. Requirement: PHP matches 6 to 16 bits of string. Only 6 to 16 characters consisting of numbers, letters, and underscores are allowed, conforming to return ture, otherwise returning false. Answer: 6 to 16 bits, the regular can be written like this: {6,16}. A regular expression of any character 6 to 16 bits is this:. {6,16} allows only a combination of numbers, letters, underscores, regular: [0-9_a-za-z] Integration, the complete regular is: ^[_0-9a-z]{6,16}$ The following is an example of applying this regular validation password. '; $password = ' abcdeasdas_1324 '; if (Ispassword ($password)) {echo ' matches ';} else {echo ' does not conform ';} Output complies with?>

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