regex101: PCRE2 (PHP) Match Workspace

Definition Group(?(DEFINE)(?<optionalSpace_H>(?:\h*)?))

Group optionalSpace_H(?<optionalSpace_H>(?:\h*)?)

Non-Capturing Group(?:\h*)?

?repeats the group contents below at most once:

\h*any horizontal whitespace character, repeated any number of times

Definition Group(?(DEFINE)(?<optionalSpace_HV>(?:(?:\h|\R)*)?))

Group optionalSpace_HV(?<optionalSpace_HV>(?:(?:\h|\R)*)?)

Non-Capturing Group(?:(?:\h|\R)*)?

?repeats the group contents below at most once:

Non-Capturing Group(?:\h|\R)*

*repeats the group contents below any number of times:

1st Alternative\h

\hany horizontal whitespace character

2nd Alternative\R

\Ra newline sequence

^start of line

(?P>optionalSpace_H)calls group optionalSpace_H as a subroutine

Comment: 'function', if it exists. Bash requires

Comment: no newline after this

Non-Capturing Group(?:function(?P>optionalSpace_H))?

?repeats the group contents below at most once:

functionthe literal text function (case sensitive)

(?P>optionalSpace_H)calls group optionalSpace_H as a subroutine

Comment: Bash allows -, :, and . in function identifiers, even if

Comment: it is not specified in POSIX

Group functionIdentifier(?<functionIdentifier>(?:\w|-|:|\.)*)

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

*repeats the group contents below any number of times:

1st Alternative\w

\wany word character

2nd Alternative-

-the literal - (45₁₀ / 55₈ / 2D₁₆)

3rd Alternative:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

4th Alternative\.

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Comment: (?=(?P>optionalSpace_HV)(?:{|\())?

Comment: Gobble up any ()

Non-Capturing Group(?:(?P>optionalSpace_H)$(?P>optionalSpace_H)$(?P>optionalSpace_H))?

?repeats the group contents below at most once:

(?P>optionalSpace_H)calls group optionalSpace_H as a subroutine

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

(?P>optionalSpace_H)calls group optionalSpace_H as a subroutine

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

(?P>optionalSpace_H)calls group optionalSpace_H as a subroutine

Comment: Start the function

Comment: (\(|{)

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

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

Search reference

Regular Expression

(?(DEFINE)(?<optionalSpace_H>(?:\h*)?)) 
(?(DEFINE)(?<optionalSpace_HV>(?:(?:\h|\R)*)?)) 

^(?P>optionalSpace_H)

# 'function', if it exists. Bash requires
# no newline after this
(?:function(?P>optionalSpace_H))?

# Bash allows -, :, and . in function identifiers, even if
# it is not specified in POSIX
(?<functionIdentifier>(?:\w|-|:|\.)*)

#(?=(?P>optionalSpace_HV)(?:{|\())?

# Gobble up any ()
(?:(?P>optionalSpace_H)\((?P>optionalSpace_H)\)(?P>optionalSpace_H))?

# Start the function
#(\(|{)

New

fn1() {}
fn2() ()
fn3() {
}

fn4() (
)
  fn1(){}
	fn2()()
  	fn3(){
    	  }
fn4()(
)
  fn1()
{}
	fn2()
()
  	fn3()
{
    	  }
fn4()
(
)

function f::n1() {}
function fn2() ()
function fn3() {
}
function fn4() (
)


function fn1 {}
function fn2 ()
function fn3 {
}
function fn4 (
)
function fn1
{}
function fn2
()
function fn3
{
}
function fn4
(
)

function	fn1	{}
function	 	fn2    ()
function 	 fn3    	  {
}
function     fn4(
)

fn1()   	  {}
fn2()	    ()
fn3()       	{
}
fn4()	(
)


fn1()   	  {
   	  }

fn2()	    (
	    )

fn3(){
       	}

fn4()	(
		)



fn6(){
echo "something"
 }


fn6(){
echo "$(echo thing)"
echo "{"
echo "("
(( 1 + 1))
echo "something"
echo "function 	 fn3    	  {"
echo "fn() {"
subfn() {
:
}
 }