how to parse the string,

[anu05446]

I have a code on a webpage in the following pattern::

Code:

for (anything might be here) {
  this is the Start of the parent for loops body

        
        for (anything might be here) {
          this is the Start of the child for loops body

            for (anything might be here) {
                  this is the Start of the 2nd child for loops body
                    
                        if {
                          
                           }     


                     2nd child for loop closes here   }

                  1st child for loop closes here   }

Parent for loop closes here }

I need to extract the body of the first for loop, so I start reading from the first curly braces, what logic should I have to keep reading till the last curly brace (I need to extract the body of the parent for loop, there are multiple parent for loops one after another.