CODEWITHSUNDEEP
c#regex
user2376998
user2376998

Reputation: 1071

Detect the word after a regex

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.

enter image description here

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?

Upvotes: 15

Views: 776

Answers (4)

MBender
MBender

Reputation: 5650

Would something like this work?

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

Groups already added for ease of use. :)

Upvotes: 1

falsetru
falsetru

Reputation: 369364

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?

Upvotes: 19

Alex Filipovici
Alex Filipovici

Reputation: 32571

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/.

Upvotes: 0

Harshil Raval
Harshil Raval

Reputation: 2145

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.

Upvotes: 0

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