regex javascript pattern

Question

I need to validate with javascript, a textbox with this format: 99/99999999/99 I've done a function that solves the problem. But I'd like to improved using Regex, but I'm new with regex. Any suggestion please?

This is how I maked before:

<asp:RegularExpressionValidator ID="RevNass" runat="server" 
ErrorMessage="NASS inválido. Formato correcto: ##/########/##" Display="None"
ValidationExpression="^\d{2}/\d{8}/\d{2}$"
ControlToValidate="TextBox1" meta:resourceKey="RevNass"/>

<asp:ValidatorCalloutExtender ID="RevNass_ValidatorCalloutExtender" 
runat="server" Enabled="True" TargetControlID="RevNass">
</asp:ValidatorCalloutExtender>

But I need to validated only with javascript in the onblur event, but i don't know how to convert this pattern "^\d{2}/\d{8}/\d{2}$" to javascript's pattern. I'm Sorry but this is urgent no time to readed a hugh tutorial, later i will.

Yes, have a look at regular-expressions.info. The expression that matches this pattern is not difficult and you should be able to create it after reading the basics. — Felix Kling
– Felix Kling, Commented Jul 11, 2011 at 9:47

ThiefMaster · Accepted Answer · 2011-07-11 09:57:35Z

2

/^[0-9]{2}\/[0-9]{8}\/[0-9]{2}$/ is a regex matching your pattern, assuming 9 can be any digit.

/^\d{2}\/\d{8}\/\d{2}$/ would work, too, but I usually prefer writing [0-9] as you immediately see what it's doing on a quick look at the regex.

edited Jul 11, 2011 at 9:57

answered Jul 11, 2011 at 9:46

ThiefMaster

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3 Comments

Toto Over a year ago

You should anchor the regex, unless it will match abc99/99999999/99def

ThiefMaster Over a year ago

Done, completely forgot that ;o

ramo2712 Over a year ago

Thanks!! I finally do this: function myFuncion(tb) { var re = new RegExp(/^\d{2}\/\d{8}\/\d{2}$/); if (tb.value.match(re)) { tb.style.border = "1px solid #cccccc"; } else{ tb.style.border = "1px solid red"; tb.title = "NASS inválido"; } }

Bojan Bjelic · Accepted Answer · 2011-07-11 10:06:42Z

0

It's practically the same, you just need to enclose the regex in forward slashes

/^\d{2}\/\d{8}\/\d{2}$/

answered Jul 11, 2011 at 10:06

Bojan Bjelic

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