How to parse string with regex with [i] inside string

Question

I have expression like this

 R403[i] == 3 and R404[i] == 2 AND R405[i] == 1 and R403[i+1] == 5 and R404[i+1] == 2 AND R405[i+1] == 1 R231[2]

And I want get all occurence of my expression using this regex

[R|M|B].*?\]

But one condition again that I want to apply it must contains variable i inside so R121[1] would not be capture.

Anyone can help?

Hint `[R|M|B]` is the same as `[BMR|]`. Read about how [character classes](http://www.regular-expressions.info/refcharclass.html) work. — Tomalak, Feb 11 '15 at 08:11

Florian Schmidinger · Accepted Answer · 2015-02-11T08:35:13.760

2

If i understood your question correctly this would be the regex:

Regex reg = new Regex(@"[RMB]\d{3}\[.*?i.*?\]");

If your "i" less expressions can come before the ones with an i use instead:

Regex reg = new Regex(@"[RMB]\d{3}\[[^]]*?i[^]]*?\]");

edited Feb 11 '15 at 08:35

answered Feb 11 '15 at 08:09

Florian Schmidinger

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thanks.. could you give me explanation about `\[.*?i.*?\]` I'm still confuse about this regex – mrhands Feb 11 '15 at 08:15
simple: the squared brackets have to contain an i at some point .*? means all characters are allowed or no characters but as few as possible – Florian Schmidinger Feb 11 '15 at 08:18
so this should match R333[1+i] as well as R344[i+1] and R333[i] – Florian Schmidinger Feb 11 '15 at 08:19
This is a special case because its after the * . see this http://stackoverflow.com/questions/3075130/difference-between-and-for-regex for explaination – Florian Schmidinger Feb 11 '15 at 08:23
Added better regex so that the order does not matter. – Florian Schmidinger Feb 11 '15 at 08:35

score 0 · Answer 2 · answered Feb 11 '15 at 08:13

0

Try this solution. It will check for group match of the pattern.

 string pattern = @"[RMB]\d{3}\[\d*\]";
 string input = " M403[50] == 3 and R404[i] == 2 AND R405[i] == 1 and R403[i+1] == 5 and R404[i+1] == 2 AND R405[i+1] == 1 R231[2]";

 foreach (Match match in matches)
 {
      Console.WriteLine("Mactch:        {0}", match.Value);
      Console.WriteLine();
  }

answered Feb 11 '15 at 08:13

Kavindu Dodanduwa

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[R|M|B] would capture the | as a literal. and he wants all that contain i not those without – Florian Schmidinger Feb 11 '15 at 08:16

How to parse string with regex with [i] inside string

2 Answers2