Combine multiple Regex.Replace calls

I've got a text processor, which includes hundreds of Regex.Replace calls. Many of them work on the same text. They would for example remove white spaces and unwanted 开发者_高级运维characters, put brackets around numbers, remove black-listed words, etc.

Is there a way to make multiple replacements with different patterns with a single call? I'm wondering about that, because my code currently is quite slow and I guess that would save some cycles.

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Yes, here is a simple example:

myText = new Regex("hello").Replace(myText, "");
myText = new Regex("goodBye").Replace(myText, "");

Could be replaced with:

myText = new Regex("hello|goodbye").Replace(myText, "");

This may or may not improve your app's performance. It really depends.

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Incase, anyone is looking to replace multiple strings with multiple values using Regex. The code

"this is sentence.".Replace("is", "are");
//output-   thare are sentence.

.... sucks because it replace every matching characters. It would not distinguish between "this" and "is". You can use dictionary and Regex like this:

Dictionary<string, string> replacements = new Dictionary<string, string>();
replacements.Add("is", "are");
replacements.Add("this", "these");
string temp;
foreach (KeyValuePair<string,string> replacement in replacements)
{
    address = Regex.Replace(address, @"\b" + replacement.Key + "\\b", replacement.Value);
}

Note: Be careful with the @"\b" + replacement.Key + "\\b" part. It gave me lots of headache.

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If it is just for whitespaces, unwanted characters and blacklisted words, why don't you try string / StringBuilder functions?

string newString = oldString.Replace('`','\0');
string newString = oldString.Replace("blackword","");

Also have a look here: Replace multiple words in string and Replace Multiple String Elements in C#