regex101: PCRE2 (PHP) Match Workspace

Group key(?<key>\w*)

\w*any word character, repeated any number of times

Comment: The key.

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

:the literal : (58₁₀ / 72₈ / 3A₁₆)

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

Comment: : with optional spaces around.

Group value(?<value> # The value. # A string value, single or double-quoted: (?<quote>["']) # Capture the double or single quote. (?:\\.|.)*? # Backslash followed by anything or any char, ungreedy. \k<quote> # The double or single quote captured before. | # Int and float numbers: (?<number>[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?) | # true, false and null (or other constants): (?<constant>true | false | null) )

1st Alternative # The value. # A string value, single or double-quoted: (?<quote>["']) # Capture the double or single quote. (?:\\.|.)*? # Backslash followed by anything or any char, ungreedy. \k<quote> # The double or single quote captured before.

Comment: The value.

Comment: A string value, single or double-quoted:

Group quote(?<quote>["'])

Character Class["']

"the literal " (34₁₀ / 42₈ / 22₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Comment: Capture the double or single quote.

Non-Capturing Group(?:\\.|.)*?

*?repeats the group contents below any number of times:

1st Alternative\\.

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

.any character (except for line terminators)

2nd Alternative.

.any character (except for line terminators)

Comment: Backslash followed by anything or any char, ungreedy.

\k<quote>the text saved by group quote

Comment: The double or single quote captured before.

2nd Alternative # Int and float numbers: (?<number>[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?)

Comment: Int and float numbers:

Group number(?<number>[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?)

Character Class[-+]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

Character Class[0-9]*

*matches any number of characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Group 5([eE][-+]?[0-9]+)?

?repeats the group contents below at most once:

Character Class[eE]

ethe literal e (101₁₀ / 145₈ / 65₁₆) (case sensitive)

Ethe literal E (69₁₀ / 105₈ / 45₁₆) (case sensitive)

Character Class[-+]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

3rd Alternative # true, false and null (or other constants): (?<constant>true | false | null)

Comment: true, false and null (or other constants):

Group constant(?<constant>true | false | null)

1st Alternativetrue

true the literal text true (case sensitive)

2nd Alternative false

false the literal text false (case sensitive)

3rd Alternative null

nullthe literal text null (case sensitive)

Global pattern flags

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

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

Search reference

Regular Expression

(?<key>\w*)        # The key.
\s*:\s*            # : with optional spaces around.
(?<value>          # The value.
  # A string value, single or double-quoted:
  (?<quote>["'])   # Capture the double or single quote.
    (?:\\.|.)*?    # Backslash followed by anything or any char, ungreedy.
  \k<quote>        # The double or single quote captured before.
|
  # Int and float numbers:
  (?<number>[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?)
|
  # true, false and null (or other constants):
  (?<constant>true | false | null)
)

New

# OK for very simple stuff, such as this:
{
  float: 'null',
  another: "foo",
  age: 45,
  type: '"simple" \' quote',
  comment: "Hello,\nA backslash \\, a tab \t and a \"dummy\" word.\nOk?",
  important: true,
  weight: 69.7,
  negative: -2.5
}

Not ok for complex stuff:

{
  subStaff: {
    help: true,
  }
}

Regular Expressions 101

Regular Expression

Substitution