Case insensitive string search

Question

What is the quickest most efficient way to search text for words using non-casesensitive search.

E.g here is my text to be searched :

string textTosearch = "Here is a paragraph or Some text. Here is some more text".

If I wanted to find the indexes of "Some" and "some", is there a .Net class that does this or would I need to use something like regular expressions.

Your thoughts are much appreciated.

I'm using visual studio 2008.

Darin Dimitrov · Accepted Answer · 2010-03-05 16:33:53Z

8

Take a look at the IndexOf method:

textTosearch.IndexOf("some", StringComparison.OrdinalIgnoreCase);

Other overloads of this method allow you to specify a start index and a number of characters to examine.

answered Mar 5, 2010 at 16:33

Darin Dimitrov

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Chris Mullins Over a year ago

I was just doing some tests, and found that given both large and small amounts of text that Text.ToLower().Contains(Value.ToLower()) is quite a bit faster for case insensitive searching than the indexOf method. Maybe there is some drawback to doing it this way though that I am not aware of.

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