Regular Expressions 101

1st Alternative\/\*[\s\S]*?\*\/

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

Character Class[\s\S]*?

*?matches any number of characters from the set below:

\sany whitespace character

\Sany non-whitespace character

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternative^\s*\/\/.*$

^start of line

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

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

$end of line

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

Detailed match information will be displayed here automatically.

26 tokens

Regular Expression

\/\*[\s\S]*?\*\/|^\s*\/\/.*$

New

alert("text");/*block comment*/alert("text");
alert("text"); // comment
alert("text");// comment no space before
// test
   	 // test
alert("/* */");
alert(" //");
url("data:image/png;base64,/* */");
url("data:image/png;base64,//");	
window.location.assign("https://www.go.com")
window.location.assign('https://www.go.com')