This is a simple example to validate an APEX item with regular expressions (on client side):
http://www.jquery4u.com/syntax/jquery-basic-regex-selector-examples/
http://www.designchemical.com/blog/index.php/jquery/form-validation-using-jquery-and-regular-expressions/
http://mdskinner.com/code/email-regex-and-validation-jquery
v_text = $('#P1_MY_ITEM').val();
v_regex = /^[a-zA-Z0-9_ .,-:;!?&\(\)"\t\r\n]+$/;
/* only number: /^[0-9]+$/; */
/* only character: /^[a-zA-Z]+$/; */
if(!v_regex.test(v_text)){
alert('ERROR');
}else{
alert('OK');
}
Important links to the topic:
http://www.jquery4u.com/syntax/jquery-basic-regex-selector-examples/
http://www.designchemical.com/blog/index.php/jquery/form-validation-using-jquery-and-regular-expressions/
http://mdskinner.com/code/email-regex-and-validation-jquery
