Regular Expressions 101

Pro

1st Alternative(\/\*([^*]|[\r\n]|(\*+([^*\/]|[\r\n])))*\*+\/)

Group 1(\/\*([^*]|[\r\n]|(\*+([^*\/]|[\r\n])))*\*+\/)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

Group 2([^*]|[\r\n]|(\*+([^*\/]|[\r\n])))*

*repeats the group contents below any number of times:

1st Alternative[^*]

Negated Character Class[^*]

*the literal * (42₁₀ / 52₈ / 2A₁₆)

2nd Alternative[\r\n]

Character Class[\r\n]

\ra carriage return (ASCII 13)

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

3rd Alternative(\*+([^*\/]|[\r\n]))

Group 3(\*+([^*\/]|[\r\n]))

\*+the literal * (42₁₀ / 52₈ / 2A₁₆) , repeated at least once

Group 4([^*\/]|[\r\n])

1st Alternative[^*\/]

Negated Character Class[^*\/]

*the literal * (42₁₀ / 52₈ / 2A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternative[\r\n]

Character Class[\r\n]

\ra carriage return (ASCII 13)

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

\*+the literal * (42₁₀ / 52₈ / 2A₁₆) , repeated at least once

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternative(\/\/.*)

Group 5(\/\/.*)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

Global pattern flags

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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

(\/\*([^*]|[\r\n]|(\*+([^*\/]|[\r\n])))*\*+\/)|(\/\/.*)

New

<?
/* This is a comment */

cout << "Hello World"; // prints Hello World

/*
 * C++ comments can  also
 */

cout << "Hello World"; 

/* Comment out printing of Hello World:

cout << "Hello World"; // prints Hello World

*/

echo "//This line was not a Comment, but ... ";
echo "http://stackoverflow.com";
echo 'http://stackoverflow.com/you can not match this line';
array = ['//', 'no, you can not match this line!!']