JavaScript

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number validation

xcuezme	10 Oct, 2008 - 01:52 AM Post #1
New D.I.C Head Joined: 10 Oct, 2008 Posts: 1	i want a javascript which will check that the 1st and 4th entered no. should not be '0' or '1'.i have this script. CODE function isValidPattern_Digits(str) { var regEx = new RegExp("[^0-9]","ig"); return !regEx.test(str); } if(phone == '' \|\| !isValidPattern_Digits(phone)) { alert("You have to input your phone number and it must have digits only."); document.frmRegistration.txtPhone.focus(); return false; } Mod edit - Added code tags.
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William_Wilson	13 Oct, 2008 - 05:48 AM Post #2
lost in compilation Joined: 23 Dec, 2005 Posts: 3,951 Thanked 13 times Dream Kudos: 3275 Expert In: Java, C, Javascript My Contributions	I don't know why you are using a double negative in your function, but this will do what you need: CODE function isValidPattern_Digits(str) { var regEx = new RegExp("^[2-9][0-9]{2}[2-9][0-9]*$","ig"); return regEx.test(str); } it matches 1 occurance of 2-9, then 2 of 0-9 another 2-9 then countless 0-9 afterwards, thus the first and fourth positions cannot be 0 or 1.
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