Replace and delete with Regular expression? - c#

if (Result.Contains("http://"))
{
string pattern = #"(http://)";
theend = Result.Substring(Result.IndexOf("http://"));
Regex rgx = new Regex(pattern);
string replacement = ""+theend+" ";
Result = rgx.Replace(Result, replacement);
}
The result is normal link (a href) and after that there is a string http://. How do I get only a link?


Not clear exactly what are you trying to do. how does the input Result looks like.
if Result only contains the URL then just change:
Result = rgx.Replace(Result, replacement);
to
Result = replacement;
Update:
Anyway, You can use this function:
private string ConvertUrlsToLinks(string msg) {
string regex = #"((www\.|(http|https|ftp|news|file)+\:\/\/)[_.a-z0-9-]+\.[a-z0-9\/_:#=.+?,##%&~-]*[^.|\'|\# |!|\(|?|,| |>|<|;|\)])";
Regex r = new Regex(regex, RegexOptions.IgnoreCase);
return r.Replace(msg, "$1").Replace("href=\"www", "href=\"http://www");
}

Related

How to remove all commas that are inside quotes (") with C# and regex

How to build a regex to remove all commas that are inside quotes(") using C# and then substitute them by #?
Example:
Initial string like this = (value 1,value 2,"value3,value4,value5",value 6)
Expected string like this = (value 1,value 2,"value3#value4#value5", value 6)

You can use
string input = "(value 1,value 2,\"value3,value4,value5\",value 6)";
var regex = new Regex("\\\"(.*?)\\\"");
var output = regex.Replace(input, m => m.Value.Replace(',','#'));

string input = "= (value 1,value 2,\"value3,value4,value5\",value 6)";
string pattern = "(?<=\".*),(?=.*\")";
string result = Regex.Replace(input, pattern, "#");

Regex pattern referred below would work to identify data within double quotes even in multiple level
Regex pattern: ([\"].*[\"])
List<string> input = new List<string>();
input.Add("= (value 1,value 2,\"value3,value4,value5\",value 6)");
input.Add("\"(value 1,value 2,\"value 3, value 4\",value 5,value 6)\"");
var regex = new Regex("([\"].*[\"])");
List<string> output = input.Select(data => regex.Replace(data, m=> m.Value.Replace(',','#'))).ToList();
foreach(string dat in output)
Console.WriteLine(dat);

C# Regex extract certain digits from a number

I am trying to extract the digits from 10:131186; and get 10131186 without the : and ;.
What is the Regex pattern I need to create?
var input = "10:131186;";
string pattern = ":(.*);";
Match m = Regex.Match(input, pattern);
Console.WriteLine(m.Value);
With the above code, I am getting :131186; instead of 10121186.

Why you need to use Regex. It's slower than using string.Replace method
string input = "10:131186;";
input = input.Replace(":", "");
input = input.Replace(";", "");
Console.WriteLine(input);

You can try using Regex.Replace:
var input = "10:131186;";
string pattern = #"(\d+):(\d+);";
string res = Regex.Replace(input, pattern, "$1$2");
Console.WriteLine(res);
and you can also use Split with Join:
var input = "10:131186;";
Console.WriteLine(string.Join("", input.Split (new char[] { ':', ';' }, StringSplitOptions.RemoveEmptyEntries)));

Please try this..
string input = "10:131186;";
input = input.Replace(":", String.Empty).Replace(";", string.Empty);

Just print the group index 1.
var input = "10:131186;";
string pattern = ":(.*);";
Match m = Regex.Match(input, pattern);
Console.WriteLine(m.Value[1]);
or use assertions.
var input = "10:131186;";
string pattern = "(?<=:).*?(?=;)";
Match m = Regex.Match(input, pattern);
Console.WriteLine(m.Value);

You could use the pattern \\d+ to match digits in the string and concatenate them into a single string.
using System;
using System.Text;
using System.Text.RegularExpressions;
public class Program
{
public static void Main()
{
string input = "10:131186;";
MatchCollection mCol = Regex.Matches(input, "\\d+");
StringBuilder sb = new StringBuilder();
foreach (Match m in mCol)
{
sb.Append(m.Value);
}
Console.WriteLine(sb);
}
}
Results:
10131186
Demo

Regular Expression in c# to find letter then \ with capital letter for letter and Shift press form of other charecter?

I want to convert a string like
m\anoj ku\mar m\a\noj
to
Manoj kUmar MAnoj
how can i do this using c#
string convert(string text)
{
string pattern = #"$1\\";
string repPattern =#"";
string returnText = Regex.Replace(text, repPattern, pattern);
return returnText;
}
What is assigneed to repPattern ? to get result

Try following:
var input = #"m\anoj ku\mar m\a\noj";
var pattern = new Regex(#"([a-z])\\");
var replaced = pattern.Replace(input, m => m.Groups[1].ToString().ToUpper());
Console.WriteLine(replaced);
UPDATE
Map digits to shift-pressed form:
string text= #"m\an1oj ku\mar m\a\no9j";
char[] shiftPressForms = ")!##$%^&*(".ToCharArray();
Regex pattern = new Regex(#"([a-z])\\");
Regex pattern_digit = new Regex(#"\d");
string replaced = pattern.Replace(text, m => m.Groups[1].ToString().ToUpper());
replaced = pattern_digit.Replace(replaced, m => shiftPressForms[int.Parse(m.Value)].ToString());
Console.WriteLine(replaced);

Get everything before the second given character using Regular Expression

I have a list of strings like
[ABC].[XXX].sdfnwoaenwaf
[ABC].[XXX].sdfnwoaenwaf
[ABC].[XX1].sdfnwoaenwaf
[ABC].[XX1].sdfnwoaenwaf
[AB1].[XX3].sdfnwoaenwaf
[AB2].[XX1].sdfnwoaenwaf
How can I get everything before the second dot? e.g. [ABC].[XXX] for the first one.

(.*)\. is the regex you need. You may test on http://regexhero.net/tester/

You could try a regex or use the LastIndexOf method of the String class or the Split method of the String class.
Regex
var toMatch = "[ABC].[XXX].sdfnwoaenwaf";
var pattern = new Regex("(.*?\\..*?)(:?\\.)");
var beforeSecondDot = pattern.Match(toMatch);
var stringBeforeSecondDot = beforeSecondDot.Groups[1].Value;
String.LastIndexOf
var toMatch = "[ABC].[XXX].sdfnwoaenwaf";
var indexOfLastDot = toMatch.LastIndexOf('.');
var beforeSecondDot = toMatch.Substring(0, indexOfLastDot);
String.Split
var toMatch = "[ABC].[XXX].sdfnwoaenwaf";
var parts = toMatch.Split('.');
var beforeSecondDot = String.Join(".", parts.Take(2));

string x = "[AB2].[XX1].sdfnwoaenwaf";
Regex regex = new Regex("([^.]+\\.[^.]+)\\.");
Match match = regex.Match(x);
if (match.Success)
{
Console.WriteLine(match.Groups[1].Value);
}
Output:
[AB2].[XX1]

List<string> finalStrings = new List<string>();
List<string> strings = new List<string>();
strings.Add("[ABC].[XXX].sdfnwoaenwaf");
strings.Add("[ABC].[XXX].sdfnwoaenwaf");
strings.Add("[ABC].[XX1].sdfnwoaenwaf");
strings.Add("[ABC].[XX1].sdfnwoaenwaf");
strings.Add("[ABC].[XX3].sdfnwoaenwaf");
strings.Add("[ABC].[XX1].sdfnwoaenwaf");
foreach (var item in strings)
{
Regex rex = new Regex("(.*)\\.");
string[] y = rex.Split(item);
finalStrings.Add(y[1]);
}

SplitString or SubString or?

Is there (.NET 3.5 and above) already a method to split a string like this:
string str = "{MyValue} something else {MyOtherValue}"
result: MyValue , MyOtherValue

Do like:
string regularExpressionPattern = #"\{(.*?)\}";
Regex re = new Regex(regularExpressionPattern);
foreach (Match m in re.Matches(inputText))
{
Console.WriteLine(m.Value);
}
System.Console.ReadLine();
dont forget to add new namespace: System.Text.RegularExpressions;

You can use regular expressions to do it. This fragment prints MyValue and MyOtherValue.
var r = new Regex("{([^}]*)}");
var str = "{MyValue} something else {MyOtherValue}";
foreach (Match g in r.Matches(str)) {
var s = g.Groups[1].ToString();
Console.WriteLine(s);
}

MatchCollection match = Regex.Matches(str, #"\{([A-Za-z0-9\-]+)\}", RegexOptions.IgnoreCase);
Console.WriteLine(match[0] + "," + match[1]);

Something like this:
string []result = "{MyValue} something else {MyOtherValue}".
Split(new char[]{'{','}'}, StringSplitOptions.RemoveEmptyEntries)
string myValue = result[0];
string myOtherValue = result[2];

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