Category: ASP.NET

25 May 2016 01:42

Joined:	13/08/2015
Level:	Silver
Points:	102

Points:	3

How to Validate Input value should be between 0.1 to 4 using Regular Expression Validator in asp.net

Hi Developers,
I am creating a project .
in my project Text Box value should be accept between from 0.1 to 4.0 only.
Valid=0.1,1.0,2.5,3.9,4.0
Invalid= 4.1, 4.5
i need to validate this.
i have no idea now i am googling it .
if anyone of you Know how to done it Please help me.

Thanks with
Paul.S

#766158

25 May 2016 03:42

Joined:	21/11/2010
Level:	Bronze
Points:	81

Points:	1

you can use
[0-3]+\.[0-9]{1,1}

also
you can use parse Float to compare values

#766160

25 May 2016 04:13

Joined:	15/12/2015
Level:	Gold
Points:	1308

Points:	4

Hi,
Use expression ^(?:4(?:\.0)?|[1-3](?:\.[0-9])?|0?\.[1-9])$ 
 0?\.[1-9] means range 0.1 to 0.9 
 1-3](?:\.[0-9])? means range 1.0 to 3.9 
 4(?:\.0)? means exact 4.0

 
string szInput= "0.1";
Regex regex123 = new Regex(@"^(?:4(?:\.0)?|[1-3](?:\.[0-9])?|0?\.[1-9])$");
var vResult = regex123.Matches(szInput).Cast<Match>().ToList();

Your vResult will contain value only when your szInput string will pass through the expression.

#766207

27 May 2016 02:54

Joined:	13/08/2015
Level:	Silver
Points:	102

Points:	1

Thanks mr.Shashi , thanks for your reply

#766212

27 May 2016 22:28

Joined:	13/06/2007
Level:	Gold
Points:	21327

Points:	2

use below regular expression
0?\.[1-4] | 1?\.[1-4] | | 0[1-4]
it allows number from 0.1 to 0.4 . and 1 to 4
see if it works
if (!System.Text.RegularExpressions.Regex.IsMatch(textbox.Text, "0?\.[1-4] | 1?\.[1-4] | | 0[1-4] "))
{
//Not allowed
}
else
{
//allowed
}

Thanks
Koolprasd2003
Editor, DotNetSpider MVM
Microsoft MVP 2014 [ASP.NET/IIS]

How to Validate Input value should be between 0.1 to 4 using Regular Expression Validator in asp.net

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