Regular Expressions 101

Positive Lookahead(?=\{((?:[^{}]++|\{(?1)\})++)\})

\{the literal { (123₁₀ / 173₈ / 7B₁₆)

Group 1((?:[^{}]++|\{(?1)\})++)

Non-Capturing Group(?:[^{}]++|\{(?1)\})++

++repeats the group contents below at least once:

1st Alternative[^{}]++

Negated Character Class[^{}]++

++matches at least one character outside the set below:

{the literal { (123₁₀ / 173₈ / 7B₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

2nd Alternative\{(?1)\}

\{the literal { (123₁₀ / 173₈ / 7B₁₆)

(?1)calls group 1 as a subroutine

\}the literal } (125₁₀ / 175₈ / 7D₁₆)

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?=\{((?:[^{}]++|\{(?1)\})++)\})

New

hello hello - helleo
    ba blab blab alb
    



{
 "collection1": [
   {
     "property1": {
       "text": "O.P.\nA few forum post ads.\nThanks.",
       "href": "bla"
     },
     "property2": "posted 2010-Jul-26, 1:21 am"
   },
 ]
}


hello2 hello2 - helleo2
    ba blab blab alb
    



{
 "collection2": [
   {
     "property1": {
       "text": "O.P.\nA few forum post ads2.\nThanks.",
       "href": "bla"
     },
     "property2": "posted 2010-Jul-26, 1:22 am"
   },
 ]
}

Regular Expression

Substitution