5

Quick question. I have a listbox being populated from a directory listing. Each file contains its name and ~#####. I'm trying to read it all into a string and replace the ~#### with nothing. The #### could be digits from length 1-6 and could be anything from 0-9. Here's the code I'm using: 

string listItem = (listBox1.SelectedItem.ToString().Replace("~*",""));

Example:

Here223~123  --->  Here
Here224~2321 ----> Here

I can't replace any number because I need the numbers before the ~

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5 Answers 5

Reset to default
12

Try

listItem.Split("~")[0]

This should give you the first string in an array of strings, that way you've lost the tilda and trailing string after that.

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6 

string listItem = Regex.Replace(listBox1.SelectedItem.ToString(), "~[0-9]{1,6}", string.Empty);

should do the trick (can't remember if you have to escape ~ though!)

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4 Comments

i would love to do the regex, but i cant get it to compile. it thinks there is a newline starting at the "
that's odd, Regex is normally pretty good with newlines ('\n's). Regex is also a great tool in your arsenal for problems like this, especially as they get more complex, as Split is not quite as specific.
@Mike, just a missing "; try it again
@Rubens thanks for the edit, hadn't noticed it'd munched my syntax!
4

What about:

string listItem = 
      listBox1.SelectedItem.ToString().Substring(0, 
           listBox1.SelectedItem.ToString().IndexOf("~"));
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2 Comments

Man, I mainly voted to get you from 9,990 to 10k. But you seem to have hit the cap for today already. :-)
@Tomalak, I already made 232 pts today; it's hard to get an accepted answer when you need one =)
4

You may be better of using the Substring(int startIndex, int lenght) method: 

string listItem = listBox1.SelectedItem.toString();
listItem = listitem.SubString(0, listItem.IndexOf("~"));
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1

the point is that string.replace does not do regular expressions

so either split on "~", or use regex

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