select text between two numbers from text file using regex u

suhas setty

file name : example.txt
inside text file
33.0.123
loading "apple\folder1\folder2"
loading "bat\folder3\folder4"
unloaded "cat\fold5\fold6"

33.0.122
loading "apple\folder1\folder2"
loading "bat\folder3\folder4"
unloaded "cat\fold5\fold6"

33.0.121
loading "apple\folder1\folder2"
loading "bat\folder3\folder4"
unloaded "cat\fold5\fold6"

i have to select text only from 33.0.123 to 33.0.122 and i want to select only loading part ,discard unloaded part using regex

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes13y ago
Accepted answer
Try the following:

using System;
using System.Text.RegularExpressions;
using System.IO;

class Program
{
static void Main()
{
string text = File.ReadAllText("example.txt");
string regExp = @"(?s)33\.0\.123.*?loading ""(.+?)"".*?loading ""(.+?)"".*?33\.0\.122";
Match m = Regex.Match(text, regExp);
Console.WriteLine(m.Groups[1].Value);
Console.WriteLine(m.Groups[2].Value);
Console.ReadKey();
}
}

The output should be:

apple\folder1\folder2
bat\folder3\folder4
Vulpes13y ago
If you don't want to hard-code the start (and end) points for the search, then this should work:

using System;
using System.Text.RegularExpressions;
using System.IO;

class Program
{
static void Main()
{
string text = File.ReadAllText("example.txt");
string start = @"33\.0\.123"; // or whatever
string finish = @"33\.0\.121"; // or whatever
string regExp1 = @"(?<=" + start + ".*)";
string regExp2 = @"loading ""(.+?)""";
string regExp3 = "(?=.*" + finish + ")";
string regExp = @"(?s)" + regExp1 + regExp2 + regExp3;
MatchCollection mc = Regex.Matches(text, regExp);
foreach(Match m in mc)
{
Console.WriteLine(m.Groups[1].Value);
}
Console.ReadKey();
}
}

As expected, the output this time is:

apple\folder1\folder2
bat\folder3\folder4
apple\folder1\folder2
bat\folder3\folder4
suhas setty13y ago
instead of hardcoding 33.0.123 ,i want to put string name
In string output ,the value 33.0.123 will be stored.
i want to use output instead of 33.0.123 and it should check n no of loadings until unloaded is found