regex101: JavaScript Substitution Workspace

Pro

1st Alternative((["'])(?:\\[\s\S]|.)*?\2|(?:[^\w\s]|^)\s*\/(?![*\/])(?:\\.|\[(?:\\.|.)\]|.)*?\/(?=[gmiy]{0,4}\s*(?![*\/])(?:\W|$)))

Group 1((["'])(?:\\[\s\S]|.)*?\2|(?:[^\w\s]|^)\s*\/(?![*\/])(?:\\.|\[(?:\\.|.)\]|.)*?\/(?=[gmiy]{0,4}\s*(?![*\/])(?:\W|$)))

1st Alternative(["'])(?:\\[\s\S]|.)*?\2

Group 2(["'])

Character Class["']

"the literal " (34₁₀ / 42₈ / 22₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Non-Capturing Group(?:\\[\s\S]|.)*?

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

1st Alternative\\[\s\S]

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

Character Class[\s\S]

\sany whitespace character

\Sany non-whitespace character

2nd Alternative.

.any character (except for line terminators)

\2the text saved by group 2

2nd Alternative(?:[^\w\s]|^)\s*\/(?![*\/])(?:\\.|\[(?:\\.|.)\]|.)*?\/(?=[gmiy]{0,4}\s*(?![*\/])(?:\W|$))

Non-Capturing Group(?:[^\w\s]|^)

1st Alternative[^\w\s]

Negated Character Class[^\w\s]

\wany word character

\sany whitespace character

2nd Alternative^

^start of line

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

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Negative Lookahead(?![*\/])

Character Class[*\/]

*the literal * (42₁₀ / 52₈ / 2A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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\[(?:\\.|.)\]

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

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

1st Alternative\\.

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

.any character (except for line terminators)

2nd Alternative.

.any character (except for line terminators)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

3rd Alternative.

.any character (except for line terminators)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Positive Lookahead(?=[gmiy]{0,4}\s*(?![*\/])(?:\W|$))

Character Class[gmiy]{0,4}

{0,4}matches between 0 and 4 characters from the set below:

gthe literal g (103₁₀ / 147₈ / 67₁₆) (case sensitive)

mthe literal m (109₁₀ / 155₈ / 6D₁₆) (case sensitive)

ithe literal i (105₁₀ / 151₈ / 69₁₆) (case sensitive)

ythe literal y (121₁₀ / 171₈ / 79₁₆) (case sensitive)

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

Negative Lookahead(?![*\/])

Non-Capturing Group(?:\W|$)

2nd Alternative\/\/.*?$

3rd Alternative\/\*[\s\S]*?\*\/

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

26 tokens

Regular Expression

((["'])(?:\\[\s\S]|.)*?\2|(?:[^\w\s]|^)\s*\/(?![*\/])(?:\\.|\[(?:\\.|.)\]|.)*?\/(?=[gmiy]{0,4}\s*(?![*\/])(?:\W|$)))|\/\/.*?$|\/\*[\s\S]*?\*\/

New

var test = [
	"// Code",
	'// Code',
    "'// Code",
    '"// Code',
	//" Comment",
	//' Comment',
	/* Comment */
	// Comment /* Comment
    /* Comment
     Comment // */ "Code",
	"Code",
    "/* Code */",
    "/* Code",
    "Code */",
    '/* Code */',
    '/* Code',
    'Code */',
    /* Comment
    "Comment",
    Comment */ "Code",
    /Code\/*/,
    "Code */"
];
    
    Code = Code / Code /* Comment */ /g; // Comment
    Code = /Code regex/g /* Comment */; // Comment

Substitution

$1

var test = [
	"// Code",
	'// Code',
    "'// Code",
    '"// Code',
	//" Comment",
	//' Comment',
	/* Comment */
	// Comment /* Comment
    /* Comment
     Comment // */ "Code",
	"Code",
    "/* Code */",
    "/* Code",
    "Code */",
    '/* Code */',
    '/* Code',
    'Code */',
    /* Comment
    "Comment",
    Comment */ "Code",
    /Code\/*/,
    "Code */"
];
    
    Code = Code / Code /* Comment */ /g; // Comment
    Code = /Code regex/g /* Comment */; // Comment