How to find and replace symbols in a string?

Question

I know it must be a very simple thing to do but I\'ve never had to treat strings before (in Objective-C) and apparently there\'s not RegEx on Cocoa-Touch.

Well, the

Answer 1

you can try this:

NSString *s = @"12.827#@584";
NSCharacterSet *removeCharSet = [NSCharacterSet characterSetWithCharactersInString:@"/:@#"];
s = [[s componentsSeparatedByCharactersInSet: removeCharSet] componentsJoinedByString: @""];
NSLog(@"%@", s);

Answer 2

You do get regex in Cocoa Touch.

Here's a good discussion of the varying degrees of regex power in iOS, the blocks example at the end should get you most of the way there.

http://volonbolon.net/post/861427732/text-handling-in-ios-4

Answer 3

I understand you're trying to figure out the number included in the UITextFields's text property and assign it to a float variable.

Try using an NSScanner for this:

NSScanner* textScanner = [NSScanner localizedScannerWithString:textfield.text];
float* floatValue;
[textScanner scanFloat:&floatValue];

floatValue now contains the parsed float value of your textfield.