正则表达式命名捕获组时出错

Question

For one of my application I'm trying to read test from <textarea> tag. Below mentioned pattern worked perfectly before, in Visual studio 2010. But in Visual studio 2013 it returns error "Specified argument was out of the range of valid values. Parameter name: i"

My regex pattern string exp = @"<textarea[^>]*id=['""]objCodePress_QB_Query['""].*?>(?<xtract>(.*?))</textarea>";

and string sample that I'm looking is

<textarea id="objCodePress_QB_Query" name="objCodePress_QB_Query" style="width:100%;" rows=20 class="codepress sql">Hello this is a test</textarea>

Is there any update in regex for new version or how I fix this ?

Answer 1

It is clear that the issue you have is related to whitespace.

When you declare the Regex object, use RegexOptions.Singleline to force the . to match any characters including a newline.

Another solution is to add (?s) right at the beginning of your pattern.