[.net] C# string manipulation question
Author
I have a System.String object, and need to retrieve an array of all substrings that match the pattern <*>. For example, if I was parsing this string:
<Hello> I am a <little> confused from the <transition> from C++ to C#
I would get an array of these strings:
<Hello>
<little>
<transition>
Any help is appreciated. Thanks!
This will give you a general idea of how to do this as I am
not writing all the code for you but this is generally how you will do it....
string myString = "Hello I am a little confused from the transition from C++ to C#";
foreach (string test in myString.Split())
{
//This is where you check your string arrays
if (test.ToLower() == "hello")
Console.WriteLine(test);
else if (test.ToLower() == "little")
Console.WriteLine(test);
else if (test.ToLower() == "transition")
Console.WriteLine(test);
}
Console.ReadKey();
not writing all the code for you but this is generally how you will do it....
string myString = "Hello I am a little confused from the transition from C++ to C#";
foreach (string test in myString.Split())
{
//This is where you check your string arrays
if (test.ToLower() == "hello")
Console.WriteLine(test);
else if (test.ToLower() == "little")
Console.WriteLine(test);
else if (test.ToLower() == "transition")
Console.WriteLine(test);
}
Console.ReadKey();
You should use Regular Expressions, something like this (I'm not an expert but this works):
using System.Text.RegularExpressions;
MatchCollection col = Regex.Matches("<Hello> I am a <little> confused from the <transition> from C++ to C#", "<[a-zA-Z]+>");
foreach(Match myString in col)
{
Console.WriteLine(myString.Value);
}
using System.Text.RegularExpressions;
MatchCollection col = Regex.Matches("<Hello> I am a <little> confused from the <transition> from C++ to C#", "<[a-zA-Z]+>");
foreach(Match myString in col)
{
Console.WriteLine(myString.Value);
}
Author
Quote:Original post by pucis
You should use Regular Expressions, something like this (I'm not an expert but this works):
using System.Text.RegularExpressions;
MatchCollection col = Regex.Matches("<Hello> I am a <little> confused from the <transition> from C++ to C#", "<[a-zA-Z]+>");
foreach(Match myString in col)
{
Console.WriteLine(myString.Value);
}
Thanks very much!
Or better
using System.Text.RegularExpressions;
MatchCollection col = Regex.Matches("<Hello> I am a <little> confused from the <transition> from C++ to C#", "<.+>");
foreach(Match myString in col)
{
Console.WriteLine(myString.Value);
}
I think . means any character
Thats on UNIX :p
using System.Text.RegularExpressions;
MatchCollection col = Regex.Matches("<Hello> I am a <little> confused from the <transition> from C++ to C#", "<.+>");
foreach(Match myString in col)
{
Console.WriteLine(myString.Value);
}
I think . means any character
Thats on UNIX :p
Quote:Original post by clauchiorean
MatchCollection col = Regex.Matches("<Hello> I am a <little> confused from the <transition> from C++ to C#", "<.+>");
Since that would be a greedy match, you'd only get a single match of "<Hello> I am a <little> confused from the <transition>".
The correct regex would be "<.*?>". The ? makes the match non-greedy; it will stop once it has a match.
the non-greedy method above is a good one, just adding the other way you could make a regex do this correctly: "<[^>]*>" which is '<' followed by 0 or more non '>' characters followed by the '>' character. Arild's answer is better in this case, but knowing how to do both is important for other situations.
This topic is closed to new replies.
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