Replace using regular expression

Question

I would like to make a function that break lines from a string.

eg.: "1. " -> "\n1. "

so i could write a code like this

string Input = "1. First option";
Input += "2. Second option";
Input += "3. Third option";

Output = WriteMenu(Input);

and get a string like this

"1. First option
\n2. Second option
\n3. Third option"

The pattern will always be [number][dot][whitespace]. It's not a problem if the first option came with new line.

So just to be clear (because it seems the current answers have overlooked this): you don't want a CRLF in front of the 1.? — slugster
– slugster, Commented Apr 4, 2012 at 0:15

Mike Park · Accepted Answer · 2012-04-04 00:12:02Z

4

Give this guy a shot

Input = Regex.Replace(Input, @"(?<!^)(\d+\.)", "\n$1")

answered Apr 4, 2012 at 0:12

Mike Park

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Comments

Petr Újezdský · Accepted Answer · 2012-04-04 00:19:34Z

2

Regex rgx = new Regex("(\\d+\\.\\s)");
String replaced = rgx.Replace(Input, Environment.NewLine + "$1");

answered Apr 4, 2012 at 0:19

Petr Újezdský

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Qtax · Accepted Answer · 2012-04-04 00:33:18Z

1

A bit shorter expression like this would work too:

Regex.Replace(Input, @"(?!^)\d+\.", "\n$0")

answered Apr 4, 2012 at 0:33

Qtax

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