Regular Expressions 101

1st Alternative(\/\/.+)

Group 1(\/\/.+)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.+any character (except for line terminators), repeated at least once

2nd Alternative(#.+)

Group 2(#.+)

#the literal # (35₁₀ / 43₈ / 23₁₆)

.+any character (except for line terminators), repeated at least once

3rd Alternative('.+)

Group 3('.+)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

.+any character (except for line terminators), repeated at least once

4th Alternative(\/\*[^(\*\/)]+?\*\/)

Group 4(\/\*[^(\*\/)]+?\*\/)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

Negated Character Class[^(\*\/)]+?

+?matches at least one character outside the set below:

(the literal ( (40₁₀ / 50₈ / 28₁₆)

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

5th Alternative(\"{3}[^(\"{3})]+?\"{3})

Group 5(\"{3}[^(\"{3})]+?\"{3})

\"{3}the literal " (34₁₀ / 42₈ / 22₁₆) , repeated exactly 3 times

Negated Character Class[^(\"{3})]+?

+?matches at least one character outside the set below:

(the literal ( (40₁₀ / 50₈ / 28₁₆)

\"the literal " (34₁₀ / 42₈ / 22₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

\"{3}the literal " (34₁₀ / 42₈ / 22₁₆) , repeated exactly 3 times

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.

Search reference

Regular Expression

(\/\/.+)|(#.+)|('.+)|(\/\*[^(\*\/)]+?\*\/)|(\"{3}[^(\"{3})]+?\"{3})

New

# Đây là 1 dòng comment

/*
	Đây là block comment
*/

// Đây là một dòng comment

'Comment tiếp nè

"""
Comment tiếp nè
"""

#include <iostream>
#include <regex>
using namespace std;
 
int main() {
	// your code goes here
	return 0;
}