Check String For Text Only?
Oct 30, 2009
I was gonna ask how to check if a string contained only letters, but i have read up a bit on regex and gotten it to work. At least i understand what ^+$ does now. Do you think this is a good way to check the string?Also, newbiequestion here: What is the difference between theese two code-blocks. What is the preferred method? Does importing only add an alias, or does it "load" more code than i need. Does it make my code depend on some "library" i need to bundle with the application later? Is there any difference whatsoev
orts System.Text.RegularExpressions
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
[code].....
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Apr 17, 2010
How to check if string entered in a text box matches a field in a data table
I have a form with two text boxes for users to enter their Username and Password. When they enter their details and click the 'Login' button I want their details to be
checked against data in a data table to see if they match or not. I am using an 'if...else' statement but can't work out the syntax to use. My code is as follows[code]...Check when string entered in a text box matches field in data table?
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Apr 17, 2010
How to check if string entered in a text box matches a field in a data table.I have a form with two text boxes for users to enter their Username and Password. When they enter their details and click the 'Login' button I want their details to be checked against data in a data table to see if they match or not. I am using an 'if...else' statement but can't work out the syntax to use. My code is as follows:[code]The fields I want to match the textbox strings against in my database table are called 'Username' and 'Password'.
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Dec 15, 2011
My application is like this : i have to search my data from database with some check box and text box when user select check box specific function go on and then when user enters some range of value in textbox then the result will shown in data grid view after that i can print it by selecting data
my vb.net code is as follow:
Imports System.Data
Imports System.Data.SqlClient
Public Class XtraForm1
[CODE]............
I m also pasting the demo picture.
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Jun 22, 2010
I got an app, which receives data via a R232 port, convert it to a string and on the other side I got a database, where the strings are saved. How can I find a way to compare the string with all strings in one database column and get back the another stringform the same row in this database. I never programmed a database
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Mar 15, 2009
We know that VB string start and end with double quotes " "
So we have to use "" if we want " in VB string.
I wonder if there is a regular expression pattern which will match VB string?.
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Oct 18, 2010
What would be the fasted method of get a string list of all values within [] in a string of text? For example: [client_name], are you are doing today? My name is [my_name]. The list of strings would be:
[Code]...
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May 17, 2011
I want to check if a string is utf-8 encoded.
UPDATE: So, the problem is: I have a php webservice. This webservice has a method that receives a string. I'm trying to pass a VB.NET JSON string to this webservice. json_decode always returns an error, saying that the string is not utf-8. If I pass the string and convert it using PHP utf8_encode, the accents get wrong!
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Jun 7, 2012
I am struggling to check for a " in a string in vb.net. Could anybody suggest a way to look for " in string as we do in c# using " " "
I have tried with, " and "" but of no use.
If partnerItem.Contains("*") Or partnerItem.Contains(""") Then
isBad = True
reportError(i + 1, colDetails(0), colDetails(1), "Field cannot contain " & PARTNER_ITEM_INVALID_CHARACTERS & " characters.")
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Apr 23, 2010
The following code checks a strings if it contains particular words and if yes it removes them. The problem is that it also removes characters that it shouldn't. For example: If user_input3 contains a word like lo(ok) it would remove the last characters ok. How can i modify the code to remove whole words only?
[Code]...
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Apr 30, 2011
I have a string, lets say "((HRARNT*50)/100) + ((HRA*10)/100)"
And, i have value for HRA, HRARNT in a DGV and i want to replace it with its value to get "((5000*50)/100) + ((3500*10)/100)"
But, problem arises when it replace HRARNT with "3500RNT" as it got HRA value in DGV.
Now, i want it to first check if its prefixed or suffixed with +,-,*,/,),( then only it should replace with its subsequent value from DGV.
Though, first i tried placing HRA,HRARNT in [] and then replace, which worked fine, but users don't want to add [].
How to implement above logic?
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Apr 10, 2011
I got a list of strings. And I want to check for every string in there. Sometimes, a string can have the suffix _anim(X) where X is an integer. If such string has that kind of suffix, I need to check for all other strings that have the same "base" (the base being the part without suffix) and finally group such strings and send them to my function.[code]...
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Jun 21, 2010
I'm reading data in from a comma-separated text file and storing the data in an array for later use. Some of the values are to remain as strings, and I need to convert some to integers, for which I was trying to use, for example, integer.parse(ar(0)).
My problem is that the string values are randomly distributed through the text file, so I need to be able to test whether the string can be converted at all before doing the conversion.
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May 17, 2011
I am just a beginner in VB programming. What if I want to check if a certain subtext is present in a string? For example, what do I code if I want to check if the word "hello" is present in a particular string or not?
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Jul 30, 2010
I want to run a check on a String right before I append it to a StringBuilder to make sure only numeric characters are in the string. What's a simple way to do that?
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Sep 16, 2009
any method that can check for specific value of a string whether it exists in the string and if it does then that whole string will be captured with that specific text.
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May 26, 2011
Dim number As String = "07747(a)" If number.... Then endif I want to be able to check inside the string to see if it only has number, if it does only contain numbers then run whatever is inside the if statment? What check do i use to check if the string only contains numeric and no alpha ot () etc ..? What i am trying to check for is mobile numbers, so 077 234 211 should be accepted, but other alphas should not be
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Feb 5, 2006
How do you check to see if a string is a numberic value?
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Mar 31, 2010
I'm trying to create an address bar, much like Google chrome's, where you can enter a url and it will navigate to it or enter just text and it will search Google etc.
I've been at this for a while Googling away, but I can't find a reasonable solution. I know I could look for things like: 'http' etc, but these come in an almost unlimited number of variations. I could also created a webbrequest to test its existence, but I think this could cause an unwanted slow down in the programs operations.
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Apr 6, 2011
I have a bit of code that looks like this:
Code:
If PageHTML.Contains("hey") Then
If PageHTML.Contains("beer") Then
If PageHTML.Contains("moose") Then
[Code].....
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Jan 27, 2012
i have an array
Dim ShippingMethod() As String = {"Standard Shipping", "Ground EST"}
Dim Shipping as String = "Ground EST"
How do i do an if statement that will check if the string Shipping is in the ShippingMethod() array
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Jun 12, 2011
Is there any way to check if the string is UNICODE using VB.net.
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May 13, 2010
I will get data in DataTable. I am going to iterate data in foreach. I will have all types of data in Datatable. Now I need to find Double for each item (string) in DataTable. How to find IsDouble for string?
Ex:I have "21342.2121" string. I need to covert this to Double. But sometimes the data will be "TextString". So I can't use Double.Parse().
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Jun 1, 2012
I am working on an application which uploads data from excel sheets into sql server database. The application will accept dates only if they are in mm/dd/yyyy format. It should reject all dates otherwise.
Now i am struggling to check its format. Here is my code.
Dim ROHSDate As String
ROHSDate = Trim(filterString(holdingTank))
...
here i need to check if it is in mm/dd/yyyy format
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Aug 19, 2009
How can i check if a string collection is empty? I tried
VB.NET
My.Settings.IPBank.Count = 0
But it said
Quote:
Object reference not set to an instance of an object.
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Jul 7, 2009
is there a way to check if a string contains characters other than numeric? ive used isnumeric quite a bit and its pretty usefull, but cant find a way to check for text in a string. Having searched around theres a few ways of doing it slowly that ive found using an array of letters and a loop / instring, but thats much more hassle than checking for numbers, so strikes me there must be a way.
[Code]...
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Nov 5, 2010
How can I check if a StringBuilder contains a certain character or string? There is no Contains method like the string class has.
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Feb 14, 2012
Using visual basic, I have a string. Want to check that the string contains a single, capital alphabetic character followed by a period. Tried to use Contains as in the following:
someString.Contains("[A-Z].") but this didn't return me what I wanted.
Also need to check for a single number followed by a period.
How can I do this in Visual Basic
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Oct 21, 2010
I have a string of randomly organized characters and I am trying to search a wordlist for matches. If the wordlist has a match I want it to add it to a listview. I wasn't for sure how to word the first two sentences and I think an example will help explainmy problem better. So here is an example. I have a textbox where you input what you want to search for in the wordlist. Lets say you type in tca . The wordlist contains cat frog dog , each word on a separate line. What i want to do is take what you typed in the textbox, tca , and find the word cat in the wordlist.
[code]...
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Aug 22, 2011
I'm having kind of a hard time about this, just would like to ask if anyone knows how to check if a string that is input by the user in a text of combo box is in the list of the combo box?
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