I have regex object:
Regex reOperation = new Regex(matchpattern);

I also have a string:
regoptions = "RegexOptions.IgnoreCase | RegexOptions.Multiline";

I would like to define the object as:
Regex reOperation = new Regex(matchpattern,regoptions);

Or in some similar fashion where regoptions is a dynamic string containing the desired RegexOptions.
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Fernando SotoRetiredCommented:
Hi ddrudik;

You cannot directly assign a string with RegexOptions to a Regex object because it is looking for an enumeration Or'ed together. The code snippet below will do that for you.


private void button1_Click(object sender, EventArgs e)
    String matchpattern = @"^\w{10}";
    RegexOptions regoptions = GetRegexOptions("RegexOptions.IgnoreCase | RegexOptions.Multiline");
    Regex reOperation = new Regex(matchpattern, regoptions);
private RegexOptions GetRegexOptions(String opt)
    RegexOptions retOpt = RegexOptions.None;
    String[] strOpt = opt.Split(new String[] {"|"}, StringSplitOptions.RemoveEmptyEntries);
    foreach (String regexOpt in strOpt)
        switch (regexOpt.Trim())
            case "RegexOptions.Compiled":
                retOpt |= RegexOptions.Compiled;
            case "RegexOptions.CultureInvariant":
                retOpt |= RegexOptions.CultureInvariant;
            case "RegexOptions.ECMAScript":
                retOpt |= RegexOptions.ECMAScript;
            case "RegexOptions.ExplicitCapture":
                retOpt |= RegexOptions.ExplicitCapture;
            case "RegexOptions.IgnoreCase":
                retOpt |= RegexOptions.IgnoreCase;
            case "RegexOptions.IgnorePatternWhitespace":
                retOpt |= RegexOptions.IgnorePatternWhitespace;
            case "RegexOptions.Multiline":
                retOpt |= RegexOptions.Multiline;
            case "RegexOptions.RightToLeft":
                retOpt |= RegexOptions.RightToLeft;
            case "RegexOptions.Singleline":
                retOpt |= RegexOptions.Singleline;
    return retOpt;

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ddrudikAuthor Commented:
Perfect, thanks.
Fernando SotoRetiredCommented:
Not a problem, glad I was able to help.  ;=)
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