Fastest way to find/replace in a large string

Question

I have a function that does a lot of finding and replacing on strings, using Regex and other string processing functions. Essentially I'm looping through a string, and adding the resulting data into a StringBuilder so its faster than modifying the string itself. Is there a faster way?

Without any code of your current approach we cannot suggest a better one. But even then it sounds as if you want to post it better at codereview.stackexchange.com. — Tim Schmelter
– Tim Schmelter, Commented Sep 16, 2012 at 19:27
If you are doing multiple replaces in one string, perhaps this would be useful: stackoverflow.com/questions/711753/… — Guffa
– Guffa, Commented Sep 16, 2012 at 19:50
U can't modify a String in C# because Strings are immutable. — qwerty
– qwerty, Commented Sep 16, 2012 at 20:04

Omar · Accepted Answer · 2012-12-10 16:39:34Z

2

Essentially I'm looping through a string, and adding the resulting data into a StringBuilder so its faster than modifying the string itself. Is there a faster way?

StringBuilder class is faster when you want to concatenate some strings into a loop.
If you're concatening an array String.Concat() is faster bacause it has some overloads which accept arrays.
else use simply the + operator if you have to do something like: string s = "text1" + "text2" + "text3"; or use String.Concat("text1", "text2", "text3");.

For more info look here: Concatenate String Efficiently.

EDIT :

The + operator compiles to a call to String.Concat() as said usr in his comment.

edited Dec 10, 2012 at 16:39

answered Sep 16, 2012 at 19:40

Omar

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usr Over a year ago

The + operator compiles to a call to String.Concat.

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