正则表达式后检测单词

Question

I have a long text and part of the text is

Hello , i am John how (1)are (are/is) you?

I used this to detect (1) .

string optionPattern = "[\\(]+[0-9]+[\\)]";
Regex reg = new Regex(optionPattern);

But I got stuck here at continue on how to detect after (1) to find are .

Full code ( thanks to falsetru for bringing me this far) :

string optionPattern = @"(?<=\(\d+\))\w+";
Regex reg = new Regex(optionPattern);

string[] passage = reg.Split(lstQuestion.QuestionContent);
foreach (string s in passage)
{
    TextBlock tblock = new TextBlock();
    tblock.FontSize = 19;
    tblock.Text = s;
    tblock.TextWrapping = TextWrapping.WrapWithOverflow;
    wrapPanel1.Children.Add(tblock);
}

I assume if I split like this, it will remove all the words after (0-9), however when I run it it only removes the word after () in the last detection.

As you can see the word after (7) is gone but the rest is not.

How do I detect the are after the (1) ?
Is it possible to replace the word after (1) with a textbox too?

Answer 1

Use positive lookbehind lookup ( (?<=\\(\\d+\\))\\w+ ):

string text = "Hello , i am John how (1)are (are/is) you?";
string optionPattern = @"(?<=\(\d+\))\w+";
Regex reg = new Regex(optionPattern);
Console.WriteLine(reg.Match(text));

prints are

Alternative: capture a group (\\w+)

string text = "Hello , i am John how (1)are (are/is) you?";
string optionPattern = @"\(\d+\)(\w+)";
Regex reg = new Regex(optionPattern);
Console.WriteLine(reg.Match(text).Groups[1]);

BTW, using @".." , you don't need to escape \\ .

---

UPDATE

Instead of using .Split() , just .Replace() :

string text = "Hello , i am John how (1)are (are/is) you?";
string optionPattern = @"(?<=\(\d+\))\s*\w+";
Regex reg = new Regex(optionPattern);
Console.WriteLine(reg.Replace(text, ""));

alternative:

string text = "Hello , i am John how (1)are (are/is) you?";
string optionPattern = @"(\(\d+\))\s*\w+";
Regex reg = new Regex(optionPattern);
Console.WriteLine(reg.Replace(text, @"$1"));

prints

Hello , i am John how (1) (are/is) you?

Answer 2

Would something like this work?

\((?<number>[0-9]+)\)(?<word>\w+)

Groups already added for ease of use. :)

Answer 3

Try this,

string text = "Hello , i am John how (1)are (are/is) you?";
string optionPattern = "[\\(]+[0-9]+[\\)]";
Regex reg = new Regex(optionPattern);
Match t = reg.Match(text);
int totallength = t.Index + t.Length;
string final = text.Substring(totallength,text.length-totallength);

in string final remaining text after (1) will store.

Answer 4

If you want to replace the text (I'm assuming that you are looking for some HTML), try:

var input = "Hello , i am John how (1)are (are/is) you?";
var output= Regex.Replace(input, @"(?<=\(\d*\))\w*", m => {
    return "<input type='text'/>";
});

And this is how the output is being rendered: http://jsfiddle.net/dUHeJ/ .