Read from string to end of string

Question

Hi I have firmly simple question, but i am not an regex ace: i have a string that looks something like this:

Some text

Error codes:

10001 iTPM full self test
10003 less than minimum required
10004 bad tag value
10005 bad param size 
10006 fail check

And using regex I am trying to get text from Error codes:, but without it, to the end of string

So far I've got:

(?<=Error codes:\n)(?s)(.*?)(fail check)

It works but its a stretch solution, I want to replace this last group with read till end but so far no luck.

Text contains line breakers as this info is needed.

Lets say c# will be my choice of language

Expected outcome shold look like:

10001 iTPM full self test
10003 less than minimum required
10004 bad tag value
10005 bad param size 
10006 fail check

I want to read to the end of string as I cannot be sure if some new codes will not be added.

Answer 1

If "Lets say c# will be my choice of language" I suggest combining Linq and regular expressions:

using System.Linq;
using System.Text.RegularExpressions;

...

string source =
  @"Some text

Error codes:

10001 iTPM full self test
10003 less than minimum required
10004 bad tag value
10005 bad param size
10006 fail check";

var result = source
  .Split(new char[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries)
  .SkipWhile(line => !line.StartsWith("Error codes:"))
  .Select(line => Regex.Match(line, @"^(?<code>[0-9]+)\s*(?<name>.+)$"))
  .Where(match => match.Success) // Or .TakeWhile(match => match.Success)
  .Select(match => $"{match.Groups["code"].Value} {match.Groups["name"].Value}")
  .ToArray(); // let's represent result as an array

Test:

Console.Write(string.Join(Environment.NewLine, result));

Outcome:

10001 iTPM full self test
10003 less than minimum required
10004 bad tag value
10005 bad param size
10006 fail check

Answer 2

Try with below regex, lookbehind from Error codes with two line breaks.

(?<=Error codes:\n\n)[\w\s]+

RegexDemo