Question

I’m developing an app to read QR code via ZXing. The code run flawlessly but i’m having problem meddling with the scanned result because i wanted to change certain word from it. consider the scanned result is this:

ID: 1001 Detail: RM9999

what should i do if i wanted to change the “9999” in the string above with another string? lets say it is

String a1 = 1500

so the expected outcome would be

ID: 1001 Detail: RM1500

edited:

@Bohemian So the actual problem is my QR code actually display like this:

ID: 1001 
Detail: RM9999

instead of the linear line that i show earlier. any workaround for this?

Answer 1

You can use lookbehind:

String s = stringFromQr.replaceAll("(?<=: RM)9999", "1500");

Which means replace all occurrences of “9999” preceded by “: RM” with “1500”.

Edit, to answer comments, you can do:

String s = stringFromQr.replaceAll("(?<=: RM)" + Pattern.quote(stringToReplace), stringToReplaceWith);

Note that I used Pattern.quote to escape any regular expression effect from it.