JS Validation with regular expressions
numbers and letters
/^[0-9a-zA-Z]+$/; /^[0-9a-zA-Z]+$/.test(somevar)
numbers
/^\d+$/
string length
length somevar.length==10
money format
/[1-9]\d*(?:.\d{0,2})?/
birthdate
/^[0123][\d]\/[01][\d]\/[12][09][\d]{2}$/i