jQuery validate plugin : accept letters only?

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Simply add a custom validator, and use it like this:

jQuery.validator.addMethod("accept", function(value, element, param) {
  return value.match(new RegExp("." + param + "$"));
});

Only numbers:

rules: {
  field: { accept: "[0-9]+" }
}

Only letters

rules: {
  field: { accept: "[a-zA-Z]+" }
}

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