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Random RegEx Question

Random RegEx Question

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killnine	25 Mar, 2008 - 08:11 AM Post #1
D.I.C Head Joined: 12 Feb, 2007 Posts: 114 Thanked: 5 times My Contributions	I have a data grid that a user can enter information into. It has to be a number, but can be an integer (42) or a float number (8.66666666669). There is no set number of digits the user must enter, but I must check for valid input. One issue I had with using: CODE if (val == null \|\| System.Text.RegularExpressions.Regex.IsMatch(val, @"[0-9]").Equals(false)) { cancelEvent.Cancel = true; } was that it only matches the first character (therefore, "8f" would match true). Every regex tutorial I can find it far too specific ("this is what you do if you want to verify 5 characters that the user inputs"). All I want to do is check the entire user's input and verify each character is a number and include a decimal point. Thoughts?
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PsychoCoder

RE: Random RegEx Question
25 Mar, 2008 - 08:30 AM

Post #2

using DIC.Core;

Joined: 26 Jul, 2007
Posts: 9,483

Windows

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Expert In: VB, VB.Net, C#, SQL, ASP, ASP.Net, Web Development, HTML, CSS, Win32 API, Javascript, mySQL, J#, Boo.Net

My Contributions

I believe the pattern you're looking for is /(^-?\d\d*\.\d*$)|(^-?\d\d*$)|(^-?\.\d\d*$)/;. You could create a method which uses this patters to validate the user input. I would do something like this (C#)

csharp


/// <summary>
/// method to validate users input. Will allow
/// for a single decimal point with as many nunmeric
/// value in front and behind the decimal
/// </summary>
/// <param name="value">value to validate</param>
/// <returns>true/false</returns>
private bool validateInput(string value) 
{
    string pattern  =  @"/(^-?\d\d*\.\d*$)|(^-?\d\d*$)|(^-?\.\d\d*$)/";
    System.Text.RegularExpressions.Regex check = new System.Text.RegularExpressions.Regex(pattern);
    //check for numeric characters
    return check.IsMatch(ValueType);
}

You could also use the same patters on the client side with JavaScript

jscript


function  validateInput(value) 
{
       //regular expression patters
        var regEx =  /(^-?\d\d*\.\d*$)|(^-?\d\d*$)|(^-?\.\d\d*$)/;
         //check for numeric characters
         return regEx.test(value);
}

Hope that helps

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killnine	RE: Random RegEx Question 26 Mar, 2008 - 10:38 AM Post #3
D.I.C Head Joined: 12 Feb, 2007 Posts: 114 Thanked: 5 times My Contributions	P.S. I think your auto-coder put in "ValueType" when you wanted to put in "value", right? (referring to your first bit of code). You are the best! Thanks again for your continued support. =) This post has been edited by PsychoCoder: 26 Mar, 2008 - 10:57 AM
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PsychoCoder	RE: Random RegEx Question 26 Mar, 2008 - 10:58 AM Post #4
using DIC.Core; Joined: 26 Jul, 2007 Posts: 9,483 Thanked: 162 times Dream Kudos: 9075 Expert In: VB, VB.Net, C#, SQL, ASP, ASP.Net, Web Development, HTML, CSS, Win32 API, Javascript, mySQL, J#, Boo.Net My Contributions	I originally had the value being passed in as ValueType but thought that looked update that reference, sorry about that Glad I could help
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