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Checking if the textbox has a semicolon
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Hi! How can I check if the data entered in textbox has a semicolon. I am aware that I should use the regex condition, but I don't get how to properly implement the semicolon on the condition. Any help? Thank you in advance.
Posted 25 Feb '13 - 4:48
jmpapa444
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Comments
ThePhantomUpvoter - 25 Feb '13 - 10:51
What have you tried? Using RegEx just to check for a semicolon is like trying to use a nuclear missile to drive a single nail in to a board.
Shelby Robertson - 25 Feb '13 - 11:21
lol
richcb - 25 Feb '13 - 10:52
You can use the RegularExpression validator provided by ASP.Net and add the regular expression to the validator and map it to the control you want to validate.

3 solutions

You can use the IndexOf method as described above of course, but there is a method called Contains that is especially designed for this:
 
        if (myTxtBox.Text.Contains(";"))
        {
            // box contains a ; so do something here
        }
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Posted 25 Feb '13 - 5:09
Nick Fisher (Consultant)1.7K
Edited 25 Feb '13 - 5:11
v2
Comments
Edo Tzumer - 25 Feb '13 - 11:50
5+
ridoy - 25 Feb '13 - 13:30
+5
use string method IndexOf to find the semicolon from text.
 
IndexOf:
This method finds the first index of the char argument. It returns -1 if the char was not found.
 
e.g.
string x = txtValue.Text;
bool hasSemicolon = x.IndexOf(';') == -1 ? false : true;
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Posted 25 Feb '13 - 4:56
abhijeetgupta19881.9K
Edited 25 Feb '13 - 5:23
Shelby Robertson 7.6K
v2
Hi,
You can also use string.Contains() method to check existance of a string in another string.
 
Example-:
bool hasSemiColon=textBox1.Text.Contains(";");
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Posted 25 Feb '13 - 5:54
Deepak_Sharma_4.3K
Edited 25 Feb '13 - 7:30
ridoy22.7K
v2
Comments
ridoy - 25 Feb '13 - 13:30
+5
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