date validation regular expression

/** Here is some handy regex to validate a date using british locale (dd/mm/yy or dd/mm/yyyy) */

Note, this allows / \ . or – as delimiters {

^(?:(?:0?[1-9])|(?:[1-2]\d)|(?:3[0-1]))[-.\\/](?:(?:0?[1-9])|(?:1[0-2]))[-.\\/](?:(?:\d{3}[1-9])|(?:\d{2}[1-9]\d)|(?:\d[1-9]\d{2})|(?:[1-9]\d{3})|(?:\d{2}))$

}

p.s. this regex has now been superseded with an improved version here