regex101: PCRE (Legacy) Substitution Workspace

Non-Capturing Group(?:"[^"]+":\s*{|\G(?!\A))

1st Alternative"[^"]+":\s*{

"the literal " (34₁₀ / 42₈ / 22₁₆)

Negated Character Class[^"]+

+matches at least one character outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

":the literal text ":

\s*any whitespace character, repeated any number of times

{the literal { (123₁₀ / 173₈ / 7B₁₆)

2nd Alternative\G(?!\A)

\Gstart of current search

Negative Lookahead(?!\A)

\Astart of string

\s*any whitespace character, repeated any number of times

Group 1("[^"]+")

"the literal " (34₁₀ / 42₈ / 22₁₆)

Negated Character Class[^"]+

+matches at least one character outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\s*any whitespace character, repeated any number of times

Group 2((?1))

(?1)calls group 1 as a subroutine

Positive Lookahead(?=[^}]*},?((?1)))

Negated Character Class[^}]*

*matches any number of characters outside the set below:

}the literal } (125₁₀ / 175₈ / 7D₁₆)

,?optionally matches the literal , (44₁₀ / 54₈ / 2C₁₆)

Group 3((?1))

(?1)calls group 1 as a subroutine

Branch Reset Group(?|(,)|\s*}(,?).*\R*)

1st Alternative(,)

Group 4(,)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

2nd Alternative\s*}(,?).*\R*

\s*any whitespace character, repeated any number of times

}the literal } (125₁₀ / 175₈ / 7D₁₆)

Group 4(,?)

,?optionally matches the literal , (44₁₀ / 54₈ / 2C₁₆)

.*any character (except for line terminators), repeated any number of times

\R*a newline sequence, repeated any number of times

Global pattern flags

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

Search reference

Regular Expression

(?:"[^"]+":\s*{|\G(?!\A))\s*("[^"]+"):\s*((?1))(?=[^}]*},?((?1)))(?|(,)|\s*}(,?).*\R*)

New

"g1": {
  "k1": "v1",
  "k2": "v2",
  "k3": "v3"
},"g1"
"g2": {
  "k4": "v4",
  "k5": "v5",
  "k6": "v6"
},"g2"
"g3": {
  "k7": "v7",
  "k8": "v8",
  "k9": "v9"
},"g3"
"g1": {
  "k1": "v1",
  "k2": "v2",
  "k3": "v3"
},"g1"
"g2": {
  "k4": "v4",
  "k5": "v5",
  "k6": "v6"
},"g2"
"g3": {
  "k7": "v7",
  "k8": "v8",
  "k9": "v9"
},"g3"
"g1": {
  "k1": "v1",
  "k2": "v2",
  "k3": "v3"
},"g1"
"g2": {
  "k4": "v4",
  "k5": "v5",
  "k6": "v6"
},"g2"
"g3": {
  "k7": "v7",
  "k8": "v8",
  "k9": "v9"
}"g3"

Substitution

{\3,\1,\2}\4\n