Regular Expressions 101

Positive Lookbehind(?<="a": )

"a": the literal text "a": (case sensitive)

Group 1({(?>[^{}]|(?1))*})

{the literal { (123₁₀ / 173₈ / 7B₁₆)

Atomic Group(?>[^{}]|(?1))*

*repeats the group contents below any number of times:

1st Alternative[^{}]

Negated Character Class[^{}]

{the literal { (123₁₀ / 173₈ / 7B₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

2nd Alternative(?1)

(?1)calls group 1 as a subroutine

}the literal } (125₁₀ / 175₈ / 7D₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

s modifier: single line. Allows a dot to match line terminators

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

(?<="a": )({(?>[^{}]|(?1))*})

New

{                   
  "a": {            
    "b": {          
      "c": {        
        "d": "v1",  
        "key": "v2" 
      }             
    },              
    "c": {          
      "g": "v3",    
      "key": "v4"   
    },              
    "key": "v5"  
    }     
  }                 
}