Incremental character replacement using regex

Question

Hello I have a string like following

Some text here -   
~XY*901*000000001~MLC*~XY*901*000000005~MLC*~XY*901*0000000010~MLC* 
Some text here

I want to have it like -

Some text here 
~XY*901*000000001~MLC*~XY*901*000000002~MLC*~XY*901*000000003~MLC* 
Some text here

Explanation: everything in between ~XY*901* and ~MLC* should be incremented by one starting from 1.

How to achieve it using Regex Match Evaluator?

I wonder how you increment these numbers if you have `5` that becomes `2` and `10` that becomes `3`. — Wiktor Stribiżew, Sep 28 '16 at 10:58
@WiktorStribiżew We can using C# match evaluators, It's just that I am not able to figure it out. — Ajay Suwalka, Sep 28 '16 at 11:18
Downvoters please leave a comment for Downvotes. It's ridiculous when my issue is clearly stated, I don't know how to explain it better than this — Ajay Suwalka, Sep 28 '16 at 11:18
The question might a dupe of http://stackoverflow.com/questions/2587866/how-does-matchevaluator-in-regex-replace-work — Wiktor Stribiżew, Sep 28 '16 at 11:20
No, It's not, Still I am working on it, will post as answer in case I succeed — Ajay Suwalka, Sep 28 '16 at 12:00
Then why ask a question in the first place? Either add the current code you need help with, or remove the off-topic question. — Wiktor Stribiżew, Sep 28 '16 at 12:02
@WiktorStribiżew It will take me time to get the solution, how can I post it right now, When I don't have the solution then why shall I not post it here? — Ajay Suwalka, Sep 28 '16 at 12:13
he was asking you to post the code you have that is not working, not to post the solution. — Maslow, May 26 '17 at 15:47
@Maslow, I resolved it completely and was about to post answer but LukStorms had posted the below answer by that time — Ajay Suwalka, Jun 01 '17 at 12:15

LukStorms · Accepted Answer · 2018-01-17T11:06:05.240

1

A bit of lambada. Erhm, I mean lambda.

var input = @"Some text here -
~XY*901*000000001~MLC*~XY*901*000000005~MLC*~XY*901*0000000010~MLC*
More text here";

var reg = new System.Text.RegularExpressions.Regex(@"(~XY\*901\*)[0-9]+(~MLC\*)");

int i = 1;
var result = reg.Replace(input, m => m.Groups[1] + i++.ToString("D9") + m.Groups[2]);

Console.WriteLine(result);

The regex Replace loops through the matches of the regular expression. While increasing the integer.

Output:

Some text here -
~XY*901*000000001~MLC*~XY*901*000000002~MLC*~XY*901*000000003~MLC*
More text here

edited Jan 17 '18 at 11:06

answered Sep 28 '16 at 12:44

LukStorms

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You rock buddy, When I was about to post my own answer just got yours thanks – Ajay Suwalka Sep 28 '16 at 14:01

Incremental character replacement using regex

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