regex101: PCRE (Legacy) Match Workspace

Explanation

Pro

1st Alternative(?x-i) # FREE-SPACE MODE, case-sensitive (?(DEFINE) (?<ws>[\r\n\t\x20]*) (?<str>"(?:\\[rntbf"\/] | [[:xdigit:]]{4} | [^\\"[:cntrl:]])*") (?<bool>true|false) (?<nil>nil) (?<num>-?\d+(?:\.\d+)?) (?<elem>(?:(?&str)|(?&bool)|(?&nil)|(?&num))(?&ws)) (?<comma>,(?&ws)) ) # JSON Array \[ (?&ws) (?: (?: (?&elem) | (?R)(?&ws) ) (?(?=(?&comma)(?:(?&elem)|[\[\{]))(?&comma)) )* \]

(?x-i)applies the following effective flags to the remainder of the pattern: gmx

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

i modifier: -insensitive. Case-sensitive match

Comment: FREE-SPACE MODE, case-sensitive

Definition Group(?(DEFINE) (?<ws>[\r\n\t\x20]*) (?<str>"(?:\\[rntbf"\/] | [[:xdigit:]]{4} | [^\\"[:cntrl:]])*") (?<bool>true|false) (?<nil>nil) (?<num>-?\d+(?:\.\d+)?) (?<elem>(?:(?&str)|(?&bool)|(?&nil)|(?&num))(?&ws)) (?<comma>,(?&ws)) )

Group ws(?<ws>[\r\n\t\x20]*)

Character Class[\r\n\t\x20]*

*matches any number of characters from the set below:

\ra carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

\ta tab character (ASCII 9)

\x20the literal (20₁₆ / 40₈ / 32₁₀)

Group str(?<str>"(?:\\[rntbf"\/] | [[:xdigit:]]{4} | [^\\"[:cntrl:]])*")

"the literal " (34₁₀ / 42₈ / 22₁₆)

Non-Capturing Group(?:\\[rntbf"\/] | [[:xdigit:]]{4} | [^\\"[:cntrl:]])*

*repeats the group contents below any number of times:

1st Alternative\\[rntbf"\/]

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

Character Class[rntbf"\/]

rthe literal r (114₁₀ / 162₈ / 72₁₆) (case sensitive)

nthe literal n (110₁₀ / 156₈ / 6E₁₆) (case sensitive)

tthe literal t (116₁₀ / 164₈ / 74₁₆) (case sensitive)

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive)

fthe literal f (102₁₀ / 146₈ / 66₁₆) (case sensitive)

"the literal " (34₁₀ / 42₈ / 22₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternative [[:xdigit:]]{4}

Character Class[[:xdigit:]]{4}

{4}matches exactly 4 characters from the set below:

[:xdigit:]a hexadecimal digit [A-Fa-f0-9]

3rd Alternative [^\\"[:cntrl:]]

Negated Character Class[^\\"[:cntrl:]]

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

[:cntrl:]a control character [\x00-\x1F\x7F]

"the literal " (34₁₀ / 42₈ / 22₁₆)

Group bool(?<bool>true|false)

1st Alternativetrue

truethe literal text true (case sensitive)

2nd Alternativefalse

falsethe literal text false (case sensitive)

Group nil(?<nil>nil)

nilthe literal text nil (case sensitive)

Group num(?<num>-?\d+(?:\.\d+)?)

-?optionally matches the literal - (45₁₀ / 55₈ / 2D₁₆)

\d+a digit, repeated at least once

Non-Capturing Group(?:\.\d+)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

Group elem(?<elem>(?:(?&str)|(?&bool)|(?&nil)|(?&num))(?&ws))

Non-Capturing Group(?:(?&str)|(?&bool)|(?&nil)|(?&num))

1st Alternative(?&str)

(?&str)calls group str as a subroutine

2nd Alternative(?&bool)

(?&bool)calls group bool as a subroutine

3rd Alternative(?&nil)

(?&nil)calls group nil as a subroutine

4th Alternative(?&num)

(?&num)calls group num as a subroutine

(?&ws)calls group ws as a subroutine

Group comma(?<comma>,(?&ws))

Comment: JSON Array

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

(?&ws)calls group ws as a subroutine

Non-Capturing Group(?: (?: (?&elem) | (?R)(?&ws) ) (?(?=(?&comma)(?:(?&elem)|[\[\{]))(?&comma)) )*

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

2nd Alternative # Or # JSON Object \{ (?&ws) (?: (?&str) (?&ws) : (?&ws) (?: (?&elem) | (?R)(?&ws) ) (?(?=(?&comma)["\[\{])(?&comma)) )* \}

Global pattern flags

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Quick Reference

25 tokens

Regular Expression

(?x-i)		# FREE-SPACE MODE, case-sensitive

(?(DEFINE)
	(?<ws>[\r\n\t\x20]*)
	(?<str>"(?:\\[rntbf"\/] | [[:xdigit:]]{4} | [^\\"[:cntrl:]])*")
	(?<bool>true|false)
	(?<nil>nil)
	(?<num>-?\d+(?:\.\d+)?)
	(?<elem>(?:(?&str)|(?&bool)|(?&nil)|(?&num))(?&ws))
	(?<comma>,(?&ws))
)

# JSON Array
\[ (?&ws)
(?:
	(?:
		(?&elem) | (?R)(?&ws)
	)
	(?(?=(?&comma)(?:(?&elem)|[\[\{]))(?&comma))
)*
\]

|	# Or

# JSON Object
\{ (?&ws)
(?:
	(?&str) (?&ws) 
	: (?&ws)
	(?:
		(?&elem) | (?R)(?&ws)
	)
	(?(?=(?&comma)["\[\{])(?&comma))
)*

\}

{
  "InstrumentationLogDateTime": "2018-06-28T13:49:33.7895781-04:00",
  "property1": "00000000-1111-2222-3333-444444444444",
  "property2": "00000000-1111-2222-3333-444444444444",
  "property3": "my application",
  "property4": "00000000-1111-2222-3333-444444444444",
  "property5": "V0300",
  "property6": "999918",
  "property7": "system",
  "property8": "Info",
  "property9": "123456",
  "property10": "xx",
  "property11": "xx",
  "property12": "page name",
  "property13": "class name",
  "property14": "method name",
  "property15": "123456",
  "property16": "123456",
  "property17": 42,
  "property18": "xx",
  "property19": "xx",
  "property20": "123456",
  "property21": "trans name",
  "property22": "42",
  "property23": "2018-06-28T13:49:28",
  "property24": "Object reference not set to an instance of an object.",
  "property25": "<?xml version=\"1.0\" encoding=\"utf-16\"?><Error ServerName=\"xxxxxx\" DateTime=\"6/28/2018 1:49:33 PM\"><Message Description=\"Object reference not se

Extraction

{
  "InstrumentationLogDateTime": "2018-06-28T13:49:33.7895781-04:00",
  "property1": "00000000-1111-2222-3333-444444444444",
  "property2": "00000000-1111-2222-3333-444444444444",
  "property3": "my application",
  "property4": "00000000-1111-2222-3333-444444444444",
  "property5": "V0300",
  "property6": "999918",
  "property7": "system",
  "property8": "Info",
  "property9": "123456",
  "property10": "xx",
  "property11": "xx",
  "property12": "page name",
  "property13": "class name",
  "property14": "method name",
  "property15": "123456",
  "property16": "123456",
  "property17": 42,
  "property18": "xx",
  "property19": "xx",
  "property20": "123456",
  "property21": "trans name",
  "property22": "42",
  "property23": "2018-06-28T13:49:28",
  "property24": "Object reference not set to an instance of an object.",
  "property25": "<?xml version=\"1.0\" encoding=\"utf-16\"?><Error ServerName=\"xxxxxx\" DateTime=\"6/28/2018 1:49:33 PM\"><Message Description=\"Object reference not se