Find text in string with C

Question

How can I find given text within a string  After that  I d like to create a new string between that and something else  For instance  if the string was   This is an example string and my data is here   And I want to create a string with whatever is between  my   and   is  how could I do that  This is pretty pseudo  but hopefully it makes sense

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First find the index of text and then substring          var ind   Directory GetCurrentDirectory   ToString   IndexOf  TEXT To find             string productFolder   Directory GetCurrentDirectory   ToString   Substring 0  ind

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using System  using System Collections Generic  using System Linq  using System Text  using System Threading Tasks  using System Threading  using System Diagnostics   namespace oops3         public class Demo                static void Main string   args                        Console WriteLine  Enter the string                string x   Console ReadLine                Console WriteLine  enter the string to be searched                string SearchText   Console ReadLine                string   myarr   new string 30                myarr   x Split                   int i   0              foreach string s in myarr                                i   i   1                  if  s  SearchText                                        Console WriteLine  The string found at position     i                                                 Console ReadLine

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Except for  Prashant s answer  the above answers have been answered incorrectly  Where is the  replace  feature of the answer  The OP asked   After that  I d like to create a new string between that and something else    Based on  Oscar s excellent response  I have expanded his function to be a  Search And Replace  function in one   I think  Prashant s answer should have been the accepted answer by the OP  as it does a replace    Anyway  I ve called my variant - ReplaceBetween     public static string ReplaceBetween string strSource  string strStart  string strEnd  string strReplace        int Start  End      if  strSource Contains strStart   amp  amp  strSource Contains strEnd                 Start   strSource IndexOf strStart  0    strStart Length          End   strSource IndexOf strEnd  Start           string strToReplace   strSource Substring Start  End - Start           string newString   strSource Concat Start strReplace End - Start           return newString            else               return string Empty

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If you know that you always want the string between  my  and  is   then you can always perform the following   string message    This is an example string and my data is here      Get the string position of the first word and add two  for it s length  int pos1   message IndexOf  my     2     Get the string position of the next word  starting index being after the first position int pos2   message IndexOf  is   pos1      use substring to obtain the information in between and store in a new string string data   message Substring pos1  pos2 - pos1  Trim

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Simply add this code      if  string Contains  search text             MessageBox Show  Message

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static void Main string   args                 int f   0          Console WriteLine  enter the string            string s   Console ReadLine            Console WriteLine  enter the word to be searched            string a   Console ReadLine            int l   s Length          int c   a Length           for  int i   0  i  lt  l  i                          if  s i     a 0                                 for  int K   i   1  j   1  j  lt  c  j    K                                          if  s K     a j                                                 f                                                                            if  f    c - 1                        Console WriteLine  matching                      else                       Console WriteLine  not found                      Console ReadLine

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This is the simplest way   if str Contains  hello

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Here s my function using Oscar Jara s function as a model   public static string getBetween string strSource  string strStart  string strEnd       const int kNotFound   -1      var startIdx   strSource IndexOf strStart      if  startIdx    kNotFound          startIdx    strStart Length        var endIdx   strSource IndexOf strEnd  startIdx         if  endIdx  gt  startIdx             return strSource Substring startIdx  endIdx - startIdx                   return String Empty      This version does at most two searches of the text  It avoids an exception thrown by Oscar s version when searching for an end string that only occurs before the start string  i e   getBetween text   my    and      Usage is the same   string text    This is an example string and my data is here   string data   getBetween text   my    is

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You can do it compactly like this   string abc   abc Replace abc Substring abc IndexOf  me     abc IndexOf  is   abc IndexOf  me      1  - abc IndexOf  size     string Empty

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I have different approach on ReplaceTextBetween   function  public static string ReplaceTextBetween this string strSource  string strStart  string strEnd  string strReplace                        if  strSource Contains strStart   amp  amp  strSource Contains strEnd                                 var startIndex   strSource IndexOf strStart  0    strStart Length                   var endIndex   strSource IndexOf strEnd  startIndex                    var strSourceLength   strSource Length                   var strToReplace   strSource Substring startIndex  endIndex - startIndex                    var concatStart   startIndex   strToReplace Length                   var beforeReplaceStr   strSource Substring 0  startIndex                    var afterReplaceStr   strSource Substring concatStart  strSourceLength - endIndex                    return string Concat beforeReplaceStr  strReplace  afterReplaceStr                              return strSource

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This is the correct way to replace a portion of text inside a string  based upon the getBetween method by Oscar Jara    public static string ReplaceTextBetween string strSource  string strStart  string strEnd  string strReplace                int Start  End  strSourceEnd          if  strSource Contains strStart   amp  amp  strSource Contains strEnd                         Start   strSource IndexOf strStart  0    strStart Length              End   strSource IndexOf strEnd  Start               strSourceEnd   strSource Length - 1               string strToReplace   strSource Substring Start  End - Start               string newString   string Concat strSource Substring 0  Start   strReplace  strSource Substring Start   strToReplace Length  strSourceEnd - Start                return newString                    else                       return string Empty                    The string Concat concatenates 3 strings    The string source portion before the string to replace found - strSource Substring 0  Start  The replacing string - strReplace The string source portion after the string to replace found - strSource Substring Start   strToReplace Length  strSourceEnd - Start

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Use this method   public static string getBetween string strSource  string strStart  string strEnd        if  strSource Contains strStart   amp  amp  strSource Contains strEnd                 int Start  End          Start   strSource IndexOf strStart  0    strStart Length          End   strSource IndexOf strEnd  Start           return strSource Substring Start  End - Start              return         How to use it   string source    This is an example string and my data is here   string data   getBetween source   my    is

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You could use Regex   var regex   new Regex    my      is      if  regex IsMatch  This is an example string and my data is here          var myCapturedText   regex Match  This is an example string and my data is here   Groups 1  Value      Console WriteLine  This is my captured text   0    myCapturedText

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string WordInBetween string sentence  string wordOne  string wordTwo                         int start   sentence IndexOf wordOne    wordOne Length   1               int end   sentence IndexOf wordTwo  - start - 1               return sentence Substring start  end

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string string1    This is an example string and my data is here    string toFind1    my    string toFind2    is    int start   string1 IndexOf toFind1    toFind1 Length   int end   string1 IndexOf toFind2  start     Start after the index of  my  since  is  appears twice  string string2   string1 Substring start  end - start

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