Regex between "\r\n"

Question

I want to match \r\n1.11.1 Entrepreneurship und Unternehmer\r\n

blabla \r\n1.11.1 Entrepreneurship und Unternehmer\r\nEs 

I tried the following RegEx:

\\r\\n\d.\d\d.\d\s+\w\\r\\n

What should it look like?

Link: https://regex101.com/r/QNXniB/1

Answer 1

The pattern matches a single word character using \w but in the example data there are 1 or more word characters with spaces in between.

Note to escape the dot \. to match it literally.

\\r\\n\d\.\d\d\.\d\s+\w+(?:\s+\w+)*\\r\\n
                     ^^^^^^^^^^^^^^

See a .NET regex demo .

If you want to match actual newlines in the text you should not double escape the \\r\\n

---

Looking at the text when there are actual newlines, you might also match the whole line that starts with a digit followed by 1 or more repetitions of a dot and digits:

^\d+(?:\.\d+)+ .*

See a regex 101 demo

Note that in .NET \d can match digits in other languages as well.

Answer 2

As there is a disparity between the titles format {index}. (ending with a . as in 1. Entrepreneurship ) vs {index}.{subindex} (not ending with a . as in n1.11.1 Entrepreneurship und Unternehmer ) we're going to need to check for both.

Check the results here .

The regex:

/(?:(?:\\r\\n)|^)(?<index>[0-9]+\.(?:[0-9]+\.?)*)(?<title>.+?)(?:(?:\\r\\n)|$)/gm

will match all headings starting with an index in the form <index>. + 0 or more sub-indexes in the form <subindex>. or <subindex> .

You also need to handle the condition of the string start and end where we won't have a \r\n sequence. This is done through (?:(?:\\r\\n)|^) and (?:(?:\\r\\n)|$) respectively.

After you match with the given regex, you can access your index and title directly by the named groups index and title ( title should be trimmed).

string text = "<your-text>";
Regex regex = new Regex("<regex>");

var match = regex.Match(text);

if (match.Success)
{
    var index = match.Groups["index"].Value;
    var title = match.Groups["title"].Value.Trim();
}