我需要找到并删除 MySQL 查询中的所有注释。我遇到的问题是避免引号或反引号内的注释标记(--、#、/* ... */)。
在 PHP 中,我使用以下代码取消注释 SQL:
$sqlComments = '@(([\'"`]).*?[^\\\]\2)|((?:\#|--).*?$|/\*(?:[^/*]|/(?!\*)|\*(?!/)|(?R))*\*\/)\s*|(?<=;)\s+@ms';
/* Commented version
$sqlComments = '@
(([\'"`]).*?[^\\\]\2) # $1 : Skip single & double quoted + backticked expressions
|( # $3 : Match comments
(?:\#|--).*?$ # - Single line comments
| # - Multi line (nested) comments
/\* # . comment open marker
(?: [^/*] # . non comment-marker characters
|/(?!\*) # . ! not a comment open
|\*(?!/) # . ! not a comment close
|(?R) # . recursive case
)* # . repeat eventually
\*\/ # . comment close marker
)\s* # Trim after comments
|(?<=;)\s+ # Trim after semi-colon
@msx';
*/
$uncommentedSQL = trim( preg_replace( $sqlComments, '$1', $sql ) );
preg_match_all( $sqlComments, $sql, $comments );
$extractedComments = array_filter( $comments[ 3 ] );
var_dump( $uncommentedSQL, $extractedComments );
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