c# Replace?

Question

I have a bunch of text files that get loaded into strings at the start of the program. These strings will have custom color codes like <red><blue> ect. But I need to replace those with the xterm color codes. Say <red> is '\e[38;5;196m' how would I do this?

Sam Hobbs · Answer

It is not useful to compare Replace with regular expressions, since regular expressions don't do a Replace, they do a search. So if you use Replace you still need a way to search and if you use regular expressions you still need to do a replace. I have written programs that convert data such as what you need to process. I wrote a program that reads the manufacturing instructions for building aircraft. I don't know what type of aircraft; it was classified. The manufacturing instructions that were converted were instructions intended only for people and had information such as the tools and material required for a manufacturing operation. There were many operations; everything required to make an entire aircraft. I assume Vulpes and other developer here have also written programs to parse text such as what you need. I would help more if I understood better what you need to do but your requirements are still quite vague. It is extremely common for programmers to use the term "one-time conversion". It means one time; that the conversion is done once and only once and never ever done again. So do you not understand " Does any of your programs read the old (current) format? "? What part do you not understand? If this data has never, ever been read by any program that you have source code for, then just say so.

Mastermosley · Answer

Thanks Vulpes, that pretty much sums up what I needed to know. And Sam, sorry I have no idea what your talking about. Thanks for your input everyone.

Vulpes · Answer

In response to Murali's question, String.Replace is much faster than Regex.Replace and should therefore be preferred for simple replacements where one is replacing a char or a string with another char or string. However, Regex.Replace is far more powerful and can deal concisely with very complex replacement scenarios where you'd need to write (and test) a considerable amount of code using ordinary string parsing methods. For example, you could use Regex.Replace to find all instances of in a piece of text, where 'x' is a hex digit, and replace them with the corresponding Xterm number using the following code: using System.Text.RegularExpressions; // ... string regExp = " "; string text2 = Regex.Replace(text, regExp, GetReplacement); static string GetReplacement(Match m) { string temp = m.Value.Substring(2, 6); // get rid of tags and ! return HexToXterm(temp); // where HexToXterm denotes your function } Here we're using a MatchEvaluator delegate to work out the replacement string.

Sam Hobbs · Answer

Please, please understand that "Just a one time deal" is mutually exclusive with "when the program loads" unless the conversion is written back out to disk and the conversion is never ever done again. If the conversion is done every time the program loads then it is not a one-time conversion. Does any of your programs read the old (current) format? When I say "your" I mean anywhere in your organization.

Mastermosley · Answer

Just a one time deal right when the program loads. It loads the file, converts those tags to the xterm code, then output is put into a string for the program to access it anytime. I have no idea how to achieve this codewise though. I could turn the string into a char array and cycle through each one untill it comes upon a

Sam Hobbs · Answer

First, it depends on whether this conversion needs to be done in the files permanently or if the conversion must be done always during execution but not written out or is there some other requirements of what data needs to be converted when and such. Those criteria make a big difference. If the files remain the same, then you still must read the old format. You just add a post-load conversion, and the way to do that depends what you data looks like after it is loaded. If you need to do a one-time conversion of the data, then just use the code that you already have to load the data, then do a conversion and write that out.

Mastermosley · Answer

Another problem I have with this is that I have to search the text file for a x can be any hex digit, and strip the tags. I have a function that converts the hex color code into an xterm number, then replace the initial with the new code. How would I go about that?

Mastermosley · Answer

Would I have to use: Regex.Replace(original, , \e[ect) Multiple times to achieve my result or is there a syntax to find multiple tags and replace them.

Muralidharan Deenathayalan · Answer

Mahesh, Which one will be faster /best ? String.Replace() or RegEx.replace()

Mahesh Chand · Answer

You can also use String.Replace method. http://www.c-sharpcorner.com/UploadFile/mahesh/2883/

Muralidharan Deenathayalan · Answer

using System; using System.IO; using System.Text.RegularExpressions; static public void ReplaceInFile( string filePath, string searchText, string replaceText ) { StreamReader reader = new StreamReader( filePath ); string content = reader.ReadToEnd(); reader.Close(); content = Regex.Replace( content, searchText, replaceText ); StreamWriter writer = new StreamWriter( filePath ); writer.Write( content ); writer.Close(); } Hope this helps you.

c# Replace?

Answers (11)