regex101: Python Substitution Workspace

Non-Capturing Group(?:^ *(?:/\*\*[^/\n]*\r?\n(?:[^/\n]*\r?\n)*[^/\n]*\*/ *|//.*)\r?\n)+

+repeats the group contents below at least once:

^start of line

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

Non-Capturing Group(?:/\*\*[^/\n]*\r?\n(?:[^/\n]*\r?\n)*[^/\n]*\*/ *|//.*)

1st Alternative/\*\*[^/\n]*\r?\n(?:[^/\n]*\r?\n)*[^/\n]*\*/ *

/the literal / (47₁₀ / 57₈ / 2F₁₆)

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

Negated Character Class[^/\n]*

*matches any number of characters outside the set below:

/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

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

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

Non-Capturing Group(?:[^/\n]*\r?\n)*

*repeats the group contents below any number of times:

Negated Character Class[^/\n]*

*matches any number of characters outside the set below:

/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

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

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

Negated Character Class[^/\n]*

*matches any number of characters outside the set below:

/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

2nd Alternative//.*

//the literal text //

.*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)

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

*repeats the group contents below any number of times:

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

Character Class[\r?\n]

\ra carriage return (ASCII 13)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

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

#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)

Character Class[\s\S]*?

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

\sa Unicode whitespace character

\Sany character that is not Unicode whitespace

^start of line

#endifthe literal text #endif (case sensitive)

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

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

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

(?:^ *(?:/\*\*[^/\n]*\r?\n(?:[^/\n]*\r?\n)*[^/\n]*\*/ *|//.*)\r?\n)+(?: *[\r?\n])*#ifdef BUILD_FLAG\r?\n[\s\S]*?^#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 
 *        
 xxxxx
 * @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