Javascript, php Regular Expression verification for mixed numbers and letters (6-15 digits)

During Website user registration, it is often necessary to verify the number of digits and letters that some fields contain, because they are not familiar with regular expressions, I 'd like to record this kind of things for use when necessary.

Php verification fields must be 6-15 characters in combination with letters and numbers

If (! Preg_match ("/^ [a-z \ d] {6, 15} $/I", $ variable )) {echo 'the password must be a combination of 6-15 digits and letters ';}

The js verification field must be a combination of 6-12 letters and numbers.

Var reg =/^ [A-Za-z0-9] + $/; if (! Reg. test (variable) | variable. length <6 | variable. length> 15) {alert ('password must be a combination of 6-15 digits and letters ');}

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