How to reqex match |. but ignore /* .* */ (comments)

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Hey Guys :-)

Is there a regex pro, who is able to give me any hints?

The target is:

don't allow things like this:

SQL

select 
*, 
table_name.* 
from 
table_name

but allow things like this:

SQL

select 
/* my special comment with a * inside */ 
table_name.id 
from 
/* my cool table */ 
table_name

My regex knowledge kept me alive, till this problem :-)

Is it even possible?
The target engine, the regex should run on is PHP 5.4+ < 7

What I have tried:

\bselect\b.*?(\*|\.\*).*?(?=\bfrom\b) and such (or other) things.

But this lookbehinds and lookaheads are disturbing my mind ;-)

Posted 18-Aug-16 11:59am

expo82

Updated 19-Aug-16 11:29am

v2

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Mohibur Rashid 18-Aug-16 20:30pm

How about doing this in two step,
1. Strip all comment
2. do your work

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expo82 · Accepted Answer · 2016-08-19T11:29:00

I think there is no other way to do it like this:

PHP

class SQLValidation
{

    const PATTERN_SQL_VALID_COMMENT = '~((\/\*).*?(\*\/))~ismu';
    const PATTERN_SQL_NOT_VALID     = '~\bselect\b.*?(\*|\.\*).*?(?=\bfrom\b)~ismu';

    /**
     * validates a sql string against * or .* in sql selectors
     * but allowes valid comments
     * 
     * @param string $queryString
     * @return bool true if there is any star selector in the queryString
     */
    public static function hasStarSelector($queryString)
    {
        $sql_without_comments = preg_replace(
           self::PATTERN_SQL_VALID_COMMENT, 
           '', 
           $queryString
        );
        return (
           preg_match(
             self::PATTERN_SQL_NOT_VALID, $sql_without_comments)
           ) ? 
        true : 
        false;
    }

 
}

How to reqex match *|.* but ignore /* .* */ (comments)