HOW DO I VALIDATE HTML TEXT INPUT e.g email and names etc? - Programmers Heaven

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HOW DO I VALIDATE HTML TEXT INPUT e.g email and names etc?

JavaScript Data Validation (All fields - see below)
1. The text field for 'visitor' name of the HTML form must be validated as follow:

a) the length of the input is bigger than 0 and less/equal to 14;
b) only letters a to z (lower case), "-" (dash) and " " (space) are allowed,
c) the "-" (dash) and " " (space) letters must be entered,
d) the "-" or the " " letter must not be either the first or the last letter entered,
e) "-" must not be the immediate neighbour or adjacent (before or after) to a " ",
f) "-" or " " must not be the immediate neighbour (adjacent) of itself.

[color=Red]I AM REQUIRED TO CREATE A FORM WHICH VALIDATES INPUT AS ABOVE BEFORE SENDING IT TO A SEVER![/color]
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