I want to get specific characters from listbox, but I don't know how to do it properly. I already used search (tried because I don't know how properly to name) but get nothing.
So i have this line in my listbox:
1,2014-01-01,Text,Text,XYZ123,Text,Text
How do i need to get only XYZ123? Its always same format, 3 letters and 3 numbers.
Thank you.
I would use a Regular Expression
The Regex of XYZ123 = \w{3}\d{3}
First solution:
Based on a small console application:
Dim i As String = "1,2014-01-01,Text,Text,**XYZ123**,Text,Text"
For Each Str As String In i.Split(",")
Dim match As Match = Regex.Match(Str, "\w{3}\d{3}")
If match.Success Then
Console.WriteLine(Str)
End If
Next
Console.ReadLine()
Second (better) solution:
Based on the comment of Chinz (all credits belong to him)
Dim i As String = "1,2014-01-01,Text,Text,**XYZ123**,Text,Text"
Console.WriteLine(Regex.Match(i, "\w{3}\d{3}").Value)
Console.ReadLine()
if all the strings have the same overall format you could split on "**" and get the [1] from the plitted
Related
I use this code to check if a String is in another String:
If StringData(1).Contains("-SomeText2.") Then
'some code
End If
'StringData(1) looks like this:
'-SomeText1.1401-|-SomeText2.0802-|-SomeText3.23-|-SomeText4.104-|
'In case I look for -SomeText1. I need 1401
'In case I look for -SomeText2. I need 0802
'In case I look for -SomeText3. I need 23
'In case I look for -SomeText4. I need 104
I first check if -SomeText2. is in StringData(1), and if it is, I need to get the next part of the text: 0802 which is the part I don't know how to do, how can I do it?
All the strings are separated by | and all substrings start and end with - and have a . separating the first part from the second. I check all the strings starting with - and ending with . because there are some with - and | in the middle, so Split function won't work.
Those strings change quite often, so I need something to check it no matter the length of the strings.
I would just split the string up and get the text between "." and "-" when the search text is found like this:
Dim str As String = "-SomeText1.1401-|-SomeText2.0802-|-SomeText3.23-|-SomeText4.104-"
Dim searches() As String = {"-SomeText1", "-SomeText2", "-SomeText3", "-SomeText4"}
For Each search As String In searches
For Each value As String In str.Split(CChar("|"))
If value.Contains(search) Then
Dim partIwant As String = value.Substring(value.IndexOf(".") + 1, value.Length - value.IndexOf(".") - 2)
MsgBox(partIwant)
'Outputs: 1401, 0802, 23, 104
Exit For
End If
Next
Next
In this example, we just use Contains() to see if our search string is present or not...we can't actually use that function to get any further information because all it returns is a True or False. So once we know that our string has been found, it's just a matter of some string manipulation to grab the text between the "." and "-" characters. IndexOf() will get us the index of the period, and then we just pull the text between there and the last character of the string.
Your question has nothing to do with WPF, so the tag and title are misleading.
To solve your problem, you should use String.IndexOf(string) instead of String.Contains(string). That tells you at which position the given string starts. If that value is -1, it means that the original string does not contain your search string at all.
Once you have that starting index, you can use String.IndexOf(string, int) to search for the next occurrence of -, so you know where the entry stops. The second parameter tells it at which index it should start the search, and in this case you should start the search at the index where you found your first match.
Now that you know the starting index of your match, the end index of the entry and the length of your search string, you can put those together and easily use String.Substring(int, int) to get the part of the string that you are interested in.
That's the straight forward, naive solution. A more sophisticated solution would simply build a regular expression for the search string that is built in a way that the part you are interested in is included in the capture group. But that's a more elaborate topic.
I've looked around but wasn't able to find an exact solution...
I have an identifier-type field that generally follows the format of XXX-YY-ZZZZZZZZ. Sometimes the number of X's and Z's will vary, but the YY's are always enclosed between the two hyphens. If I wanted to create another field using just the "YY", what would be the best function to use? There's also another reference table with the YYs listed that I intend to relate it to.
Thanks in advance.
Sounds like you want to split the string into an array. Try this out
Public Sub Example()
Dim ExampleStr As String: ExampleStr = "XXX-YY-ZZZZZZZZ"
Dim StrArray() As String
StrArray = Split(ExampleStr, "-")
Debug.Print StrArray(1) ' Return the second element
End Sub
I would like my program to check for user input for a specific pattern. I've indicate using a label beside it that this particular TextBox1 must be in this format "XX/XX" (where as XX must be numeric ONLY and can have unlimited characters).
However there are no coding side checking to check for user input. Currently the solution I search in internet is using
Dim sMatch As Boolean
sMatch = TextBox1.Text Like "[0-9]/[0-9]"
The only problem is it only accept single digit of number. For example 5/4, what I want is a dynamic input for example 123/1 or 9/12 or 999999/30000. Thanks in advance.
You were almost there,
sMatch = TextBox1.Text Like "\d{1,}/\d{1,}"
or
sMatch = TextBox1.Text Like "[0-9]{1,}/[0-9]{1,}"
Good reference is from: https://msdn.microsoft.com/en-us/library/az24scfc(v=vs.110).aspx
\d Matches any decimal digit.
{n,} Matches the previous element at least n times
I think it is better to use Masked Text boxes in this scenario.
or you can try this also
Sub Main()
Dim regex As Regex = New Regex("[0-9][0-9]/[0-9][0-9]")
Dim match As Match = regex.Match("x1/1x2")
If match.Success Then
Console.WriteLine(match.Value)
Else
Console.WriteLine("Does not match")
End If
Console.ReadKey()
End Sub
Hey guys I'm stuck with this question. Please help.
I want to write a program that can extract alphabetical characters and special characters from an input string. An alphabetical character is any character from "a" to "z"(capital letters and numbers not included") a special character is any other character that is not alphanumerical.
Example:
string = hello//this-is-my-string#capetown
alphanumerical characters = hellothisismystringcapetown
special characters = //---#
Now my question is this:
How do I loop through all the characters?
(the for loop I'm using reads like this for x = 0 to strname.length)...is this correct?
How do I extract characters to a string?
How do I determine special characters?
any input is greatly appreciated.
Thank you very much for your time.
You could loop through each character as follows:
For Each _char As Char In strname
'Code here
Next
or
For x as integer = 0 to strname.length - 1
'Code here
Next
or you can use Regex to replace the values you do not need in your string (I think this may be faster but I am no expert) Take a look at: http://msdn.microsoft.com/en-us/library/xwewhkd1.aspx
Edit
The replacement code will look something as follows although I am not so sure what the regular expression (variable called pattern currently only replacing digits) would be:
Dim pattern As String = "(\d+)?" 'You need to update the regular expression here
Dim input As String = "123//hello//this-is-my-string#capetown"
Dim rgx As New Regex(pattern)
Dim result As String = rgx.Replace(input, "")
Since you need to keep the values, you'll want to loop through your string. Keeping a list of characters as a result will come in handy since you can build a fresh string later. Then take advantage of a simple Regex test to determine where to place things. The psuedo code looks something like this.
Dim alphaChars As New List(Of String)
Dim specialChars As New List(Of String)
For Each _char As Char in testString
If Regex.IsMatch(_char, "[a-z]")) Then
alphaChars.Add(_char)
Else
specialChars.Add(_char)
End If
Next
Then If you need to dump your results into a full string, you can simply use
String.Join(String.Empty, alphaChars.ToArray())
Note that this code makes the assumption that ANYTHING else than a-z is considered a special character, so if needs be you can do a second regular expression in your else clause to test for you special characters in a similar manner. It really depends on how much control you have over the input.
I have a text file that has multiple blank lines and Im trying to return all the lines between two of them specifically
so if I have a file that looks like this:
____________________________
1########################
2##########################
3
4########################
5##########################
6#######################
7
8#########################
9##########################
10#######################
11####################
12########################
13#########################
14
15##########################
----------------------------
I would like to grab lines 8-13. Unfortunately, it might not always be 8-13 as it could be 9-20 or 7-8, but it will however always be between the 2nd and 3rd line break.
I know how to trim characters and pull out singular lines, but I have no idea how to trim entire sections.
Any help would be appreciated, even if you just point me to a tutorial.
Thanks in advance.
The basic idea here is to get the entire thing as a string, split it into groups at the double line breaks, and then reference the group you want (in your case, the third one).
Dim value As String = File.ReadAllText("C:\test.txt")
Dim breakString As String = Environment.NewLine & Environment.NewLine
Dim groups As String() = value.Split({breakString}, StringSplitOptions.None)
Dim desiredString As String = groups(2)
MsgBox(desiredString)
Edit:
In response to the question in your comment -
Environment.NewLine is a more dynamic way of specifying a line break. Assuming you're running on windows - you could use VbCrLf as well. The idea is that if you were to compile the same code on Linux, it Environment.NewLine would generate a Lf instead. You can see here for more information: http://en.wikipedia.org/wiki/Newline
The reason I used Environment.NewLine & Environment.NewLine is because you want to break your information where there are two line breaks (one at the end of the last line of a paragraph, and one for the blank line before the next paragraph)
What I ended up doing was trimming the last part and searching for what I needed in the first part (I know I didnt include the searching part in the question, but I was just trying to figure out a way to narrow down the search results as it would have had repeated results). Im posting this incase anyone else stumbles upon this looking for some answers.
Dim applist() = System.IO.File.ReadAllLines("C:\applist.txt")
Dim findICSName As String = "pid"
Dim ICSName As New Regex("\:.*?\(")
Dim x = 0
Do Until applist(x).Contains("Total PSS by OOM adjustment:")
If applist(x).Contains(findICSName) Then
app = ICSName.Match(applist(x)).Value
app = app.TrimStart(CChar(": "))
app = app.TrimEnd(CChar("("))
ListBox1.Items.Add(app)
End If
x = x + 1
Loop
End If
How this works is that it looks through each line for the regex until it reaches first word in the breakpoint "Total PSS by OOM adjustment:"