regex101: Python Substitution Workspace

Group 1(/\*[\s\S]*?\*/|\/\/.*?$|\/\/.*?\n)*

*repeats the group contents below any number of times:

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:

\sa Unicode whitespace character

\Sany character that is not Unicode whitespace

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternative\/\/.*?$

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

$end of line

3rd Alternative\/\/.*?\n

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

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

Group 2(#ifdef BUILD_FLAG\r?\n(?:.*\r?\n)*?#endif\r?\n)

#ifdef BUILD_FLAGthe literal text #ifdef BUILD_FLAG (case sensitive)

\r?optionally matches a carriage return (ASCII 13)

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

Non-Capturing Group(?:.*\r?\n)*?

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

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

\r?optionally matches a carriage return (ASCII 13)

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

#endifthe literal text #endif (case sensitive)

\r?optionally matches a carriage return (ASCII 13)

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

the literal ↵ (10₁₀ / 12₈ / A₁₆)

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

Search reference

Regular Expression

(/\*[\s\S]*?\*/|\/\/.*?$|\/\/.*?\n)*(#ifdef BUILD_FLAG\r?\n(?:.*\r?\n)*?#endif\r?\n)

New

    Code here
      and here

//this is s comment block
/**
*and a nested comment block
*/

//-----------------------------------------------------------------------------
// this comment block should not be captured
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// this whole comment block and the conditional block below should be captured
//-----------------------------------------------------------------------------
/**
 * @brief Some comment 
 *        
 *
 * @return 
 */
//-----------------------------------------------------------------------------
#ifdef BUILD_FLAG
...
#endif

    More code
More code

//---------------------------------------------------------
// this whole comment block and the conditional block below should be captured
// --------------------------------------------------------
#ifdef BUILD_FLAG
...
#endif

More code

    //-------------------------------------------------------------------------
    /**
     * @name this whole block comment should be captured.
     * @{
     */

#ifdef BUILD_FLAG
...
#endif