CODEWITHSUNDEEP
asp.netregex
Shri
Shri

Reputation: 29

C# Regular expression for input values of Textbox

I want to validate the text within a textbox using a regular expression.
The text should be a number greater than 0 and less than and equal to 1000.

Upvotes: 2

Views: 3056

Answers (3)

Mazdak Shojaie
Mazdak Shojaie

Reputation: 1698

I found it:

^([1-9]|[1-9][0-9]|[1-9][0-9][0-9])$|^(1000)

I test it in range 0~1000

Upvotes: 0

Ria
Ria

Reputation: 10367

Try this regex:

//for  0 < x < 1000
^((?<=[1-9])0|[1-9]){1,3}$

explain:

(?<=[1-9])0     //look behind to see if there is digits (1-9)

test:

0   ->  invalid
000 ->  invalid
45  ->  valid
5   ->  valid      'Ashwin Singh' solution can not capture this
101 ->  valid
999 ->  valid
1000    ->  invalid
12345   ->  invalid
10000   ->  invalid
2558    ->  invalid
205 ->  valid
1001    ->  invalid
2000    ->  invalid

And better way convert to Decimal (if you dont use regular expression validator):

Decimal dc = Decimal.TryParse(textBox.Text);
if( dc > 0 && dc < 1000)
// do some thing

Upvotes: 0

Ashwin Singh
Ashwin Singh

Reputation: 7345

"^[1-9][0-9]*{1,2}$" is the regex you are looking for.

if(Regex.IsMatch(YourTextBox.Text,"^[1-9][0-9]*{1,2}$"))
{
    //Write your logic here 
}

Upvotes: 3

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