Why regex.split not splits with $

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i am using Regex.Split to split my string as:

C#

string str = "12$34$45";
string [] result= Regex.Split(str,"$");

but it is not splitting ..When i tried splitting by # then it works.

What I have tried:

C#

string str = "12$34$45";
string [] result= Regex.Split(str,"$");

Posted 5-May-18 1:53am

xpertzgurtej

Updated 5-May-18 2:32am

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Patrice T · Answer 1 · 2018-05-05T02:03:00

Solution 1

Because '$' is a special meaning in a RegEx, knowing this is regEx 101.
you need to escape it as @"\$"

Just a few interesting links to help building and debugging RegEx.
Here is a link to RegEx documentation:
perlre - perldoc.perl.org[^]
Here is links to tools to help build RegEx and debug them:
.NET Regex Tester - Regex Storm[^]
Expresso Regular Expression Tool[^]
RegExr: Learn, Build, & Test RegEx[^]
This one show you the RegEx as a nice graph which is really helpful to understand what is doing a RegEx:
Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.[^]

Posted 5-May-18 2:03am

Patrice T

Comments

xpertzgurtej 5-May-18 8:06am

with single $ it works. but for :
string str = "12$$34$$45";
string [] result= Regex.Split(str, @"\$$");

it doesn't work. How to handle this?

Actually i want to split my string and separator may be of multiple characters.
e.g.:
string str = "12$$34$$45";
string separator = "$~$";
string [] result= Regex.Split(str, @"\"+ separator + "");

Kenneth Haugland 5-May-18 8:47am

You need the \ before all the times you are going to match the special case $
string[] result = Regex.Split(str, @"\$\$");

Patrice T 5-May-18 8:52am

Try @"\$+"

xpertzgurtej 5-May-18 8:31am

I found the solution:
string str = "12$$34$$45";
string separator = "$$";

string[] partsFromString = str.Split(new string[] { separator }, StringSplitOptions.None);

Richard MacCutchan 5-May-18 8:36am

A slightly better way would be

string[] partsFromString = str.Split(new Char[] {'$'}, StringSplitOptions.RemoveEmptyEntries);

As that allows any number of dollar signs.

xpertzgurtej 5-May-18 8:41am

separator is not fixed. So i cant use {'$'}

Richard MacCutchan 5-May-18 9:16am

Well that is not a problem. You just feed in the separator character from somewhere else.

Kenneth Haugland · Answer 2 · 2018-05-05T02:33:00

Solution 2

Just do this:

string[] result = Regex.Split(str, "[$]");

The operator [ ] represents a class of characters, so the regex trys to match all that is inside these brackets.

For multiple $ (2 in this case):

string[] result = Regex.Split(str, "[$]{2}");

Posted 5-May-18 2:33am

Kenneth Haugland

Updated 5-May-18 2:50am

v2