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How can I get only the first line of multiline text using regular expressions?
string test = @"just take this first line
even there is
some more
lines here";
Match m = Regex.Match(test, "^", RegexOptions.Multiline);
if (m.Success)
Console.Write(m.Groups[0].Value);
951
To constrain your text so only a certain amount of it appears regardless of how much a cell contains, you can double-click on the cell, insert your cursor after the last character you want to be visible and press "Alt-Enter" to add a manual line break.
You could use the second parameter for string. Split(Char[], Int32) to define the max number of substrings to return. This will limit the array size. Put 2 there and the first line goes to first item and the rest of the lines to second item.
To read the first line of a file in Python, use the file. readline() function. The readline() is a built-in function that returns one line from the file. Open a file using open(filename, mode) as a file with mode “r” and call readline() function on that file object to get the first line of the file.
On Windows, you can type Control + J to enter the equivalent of a new line character for the "Other" delimiter. You can also use Control + J for new line during search and replace operations.
If you just need the first line, you can do it without using a regex like this
var firstline = test.Substring(0, test.IndexOf(Environment.NewLine));
As much as I like regexs, you don't really need them for everything, so unless this is part of some larger regex exercise, I would go for the simpler solution in this case.
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