C# RegEx Not returning what it should

Question

I got this Regex problem where I need to select the last part of a string however no matter what I do it will only select on till it hit's a "\n" (newline) Here's what I have tried so far

sms = Regex.Match(datalog, "\"\\r\\n.*").ToString();

Or

sms = Regex.Match(datalog, @"\""\r\n.*").ToString();

Here is what datalog contains

"\r\n+CMT: \"+4528835769\",,\"13/09/11,15:09:32+08\"\r\nLinje 1\nLinje2\nLinje 3\r\n

And what i need the Rexex to return

"\r\nLinje 1\nLinje2\nLinje 3\r\n

but this is what it returns (and what the string sms ends up containing)

"\"\r\nLinje 1"

What am I doing wrong?? since it stops selecting after Linje 1\n I assume the problem is with the newline.

I have also tried using .+ instead of .* but the result is the same

EDIT: I found that it was as simple as:

sms = Regex.Match(datalog, @"\""\r\n.*", RegexOptions.Singleline).ToString();

Gusdor · Accepted Answer · 2013-09-12 08:12:55Z

period (.) does not match new lines by default. You need to enable this behavior by specifying RegexOptions.SingleLine.

The dot matches a single character, without caring what that character is. The only exception are newline characters. In all regex flavors discussed in this tutorial, the dot will not match a newline character by default. So by default, the dot is short for the negated character class [^\n] (UNIX regex flavors) or [^\r\n] (Windows regex flavors).

...

All regex flavors discussed here have an option to make the dot match all characters, including newlines. In RegexBuddy, EditPad Pro or PowerGREP, you simply tick the checkbox labeled "dot matches newline".

...

When using the regex classes of the .NET framework, you activate this mode by specifying > RegexOptions.Singleline, such as in Regex.Match("string", "regex", RegexOptions.Singleline).

Source: http://www.regular-expressions.info/dot.html

toadflakz · Accepted Answer · 2013-09-12 08:17:17Z

1

Change your method call to...

sms = Regex.Match(datalog, @"\""\r\n.*", RegexOptions.MultilineMode);

Multiline mode ignores newlines, carriage returns etc.

More details at MSDN - Multiline Mode

answered Sep 12, 2013 at 8:17

toadflakz

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1 Comment

Gusdor Over a year ago

Multiline mode does not affect dot/period.

Palin Revno · Accepted Answer · 2013-09-12 08:11:59Z

0

There is an option in the Regex to use multiline mode. Here is an example :

http://www.dotnetperls.com/regexoptions-multiline

answered Sep 12, 2013 at 8:11

Palin Revno

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4 Comments

Gusdor Over a year ago

Multiline mode does not affect dot/period, only $ and ^

Palin Revno Over a year ago

Look at the MSDN example from toadflakz. That's very close to what is required in the question. Just needs a bit tweaking.

Palin Revno Over a year ago

"By default, $ matches only the end of the input string. If you specify the RegexOptions.Multiline option, it matches either the newline character (\n) or the end of the input string. It does not, however, match the carriage return/line feed character combination. To successfully match them, use the subexpression \r?$ instead of just $. "

Gusdor Over a year ago

Or, use singleline mode and leave the pattern unchanged ;)

Hans Keﬆing · Accepted Answer · 2013-09-12 08:26:27Z

0

You can change your regex line to

sms = Regex.Match(datalog, "(?<=\"\\r\\n).*", RegexOptions.Singleline).ToString();

The (?<=...) excludes that group from the reported match, so that it starts with "Linje 1". If you do need that, you can revert to your original regex.

The RegexOptions.Singleline changes the . to match also newlines/returns.

answered Sep 12, 2013 at 8:26

Hans Keﬆing

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