c regex matches example

Question

I am trying to get values from the following text  How can this be done with Regex   Input     Lorem ipsum dolor sit  download  456 amet  consectetur adipiscing  download  3434 elit  Duis non nunc nec mauris feugiat porttitor  Sed tincidunt blandit dui a viverra download  298  Aenean dapibus nisl  download  893434 id nibh auctor vel tempor velit blandit     Output  456   3434   298    893434

User · Answer

Regex regex   new Regex   download    d       RegexOptions SingleLine   Matches m   regex Matches input     I think will do the trick  not tested

User · Answer

public void match2                 string input     download  893434           Regex word   new Regex    d             Match m   word Match input           Console WriteLine m Value

User · Answer

So you re trying to grab numeric values that are preceded by the token   download      Try this pattern      lt   download    d    That should work  I don t think   or   are special characters in  NET Regex  but you ll have to either escape the backslash like    or use a verbatim string for the whole pattern   var regex   new Regex      lt   download    d     return regex Matches strInput     Tested here  http   rextester com BLYCC16700  NOTE  The lookbehind assertion    lt       is important because you don t want to include  download   in your results  only the numbers after it  However  your example appears to require it before each string you want to capture  The lookbehind group will make sure it s there in the input string  but won t include it in the returned results  More on lookaround assertions here

User · Answer

This pattern should work     d  foreach var match in System Text RegularExpressions RegEx Matches input     d          Console WriteLine match Value        I m not in front of Visual Studio  but even if that doesn t compile as-is  it should be close enough to tweak into something that works

User · Answer

It looks like most of post here described what you need here  However - something you might need more complex behavior - depending on what you re parsing  In your case it might be so that you won t need more complex parsing - but it depends what information you re extracting   You can use regex groups as field name in class  after which could be written for example like this   using System  using System Collections Generic  using System Linq  using System Reflection  using System Text RegularExpressions   public class Info       public String Identifier      public char nextChar      class testRegex        const string input    Lorem ipsum dolor sit  download  456 amet  consectetur adipiscing  download  3434 elit           Duis non nunc nec mauris feugiat porttitor  Sed tincidunt blandit dui a viverra download  298  Aenean dapibus nisl  download  893434 id nibh auctor vel tempor velit blandit         static void Main string   args                Regex regex   new Regex    download     lt Identifier gt  0-9      lt nextChar gt      lt thisCharIsNotNeeded gt               List lt Info gt  infos   new List lt Info gt              foreach  Match match in regex Matches input                         Info info   new Info                for  int i   1  i  lt  regex GetGroupNames   Length  i                                   String groupName   regex GetGroupNames   i                    FieldInfo fi   info GetType   GetField regex GetGroupNames   i                     if  fi    null      Field is non-public or does not exists                      fi SetValue  info  Convert ChangeType  match Groups groupName  Value  fi FieldType                              infos Add info                      foreach   var info in infos                         Console WriteLine info Identifier     followed by      info nextChar ToString                                 This mechanism uses C  reflection to set value to class  group name is matched against field name in class instance  Please note that Convert ChangeType won t accept any kind of garbage   If you want to add tracking of line   column - you can add extra Regex split for lines  but in order to keep for loop intact - all match patterns must have named groups   Otherwise column index will be calculated incorrectly   This will results in following output   456 followed by     3434 followed by     298 followed by     893434 followed by

User · Answer

All the other responses I see are fine  but C  has support for named groups   I d use the following code   const string input    Lorem ipsum dolor sit  download  456 amet  consectetur adipiscing  download  3434 elit  Duis non nunc nec mauris feugiat porttitor  Sed tincidunt blandit dui a viverra download  298  Aenean dapibus nisl  download  893434 id nibh auctor vel tempor velit blandit     static void Main string   args        Regex expression   new Regex    download     lt Identifier gt  0-9           var results   expression Matches input       foreach  Match match in results                Console WriteLine match Groups  Identifier   Value             The code that reads     lt Identifier gt  0-9    specifies that  0-9   s results will be part of a named group that we index as above  match Groups  Identifier   Value

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