How to force text to be Upper case except selective strings c#

Question

C#:

string mystring = "Hello World. &amp; my name is &lt; bob &gt;. Thank You."
Console.Writeline(mystring.ToUpper())

I am trying to get all the text to be uppercase except--

&amp;  &lt;  &gt;

Because these are my encoding and the encoding wont work unless the text is lower case.

Wiktor Stribiżew · Accepted Answer · 2017-01-03 15:10:48Z

1

You may split the string with a space, turn all the items not starting with & to upper and just keep the rest as is, and then join back into a string:

string mystring = "Hello World. &amp; my name is &lt; bob &gt;. Thank You.";
string result = string.Join(" ", mystring.Split(' ').Select(m => m.StartsWith("&") ? m : m.ToUpper()));

Another approach is to use a regex to match &, 1+ word chars and then a ;, and match and capture other 1+ word char chunks and only turn to upper case the contents in Group 1:

var result = System.Text.RegularExpressions.Regex.Replace(mystring, 
    @"&\w+;|(\w+)", m => 
           m.Groups[1].Success ? m.Groups[1].Value.ToUpper() :
           m.Value
);

edited Jan 3, 2017 at 15:10

answered Jan 3, 2017 at 15:04

Wiktor Stribiżew

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2 Comments

Dev Over a year ago

Thank you! I was just about to ask you if there is a way of doing it without Linq because I am using a cut down version of c# in another Software. The second aproach works perfectly well.

Wiktor Stribiżew Over a year ago

The second option is using a Match evaluator. You may also define a separate method and pass it instead of the lambda expression.

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