Regex to remove single-line SQL comments (--)

Question

Question:

Can anybody give me a working regex expression (C#/VB.NET) that can remove single line comments from a SQL statement ?

I mean these comments:

Answer 1

Using System.Text.RegularExpressions;

public static string RemoveSQLCommentCallback(Match SQLLineMatch)
{
    System.Text.StringBuilder sb = new System.Text.StringBuilder();
    bool open = false; //opening of SQL String found
    char prev_ch = ' ';

    foreach (char ch in SQLLineMatch.ToString())
    {
        if (ch == '\'')
        {
            open = !open;
        }
        else if ((!open && prev_ch == '-' && ch == '-'))
        {
            break;
        }
        sb.Append(ch);
        prev_ch = ch;
    }

    return sb.ToString().Trim('-');
}

The code

public static void Main()
{
    string sqlText = "WHERE DEPT_NAME LIKE '--Test--' AND START_DATE < SYSDATE -- Don't go over today";
    //for every matching line call callback func
    string result = Regex.Replace(sqlText, ".*--.*", RemoveSQLCommentCallback);
}

Let's replace, find all the lines that match dash dash comment and call your parsing function for every match.