I'm trying to write a function which takes in a string such as String code = "<div> style="width: 3%" </div>"
I would like to replace the 3% to another number (can be more than 2 digits) so 400% etc.
I'm currently getting the charAt(21) but this is only the index of 3, so if I had 20% in that place then my code would not work.
Is there another way to replace the place where the % is stored. (also doing this by not knowing what number the current % is)
You can do this using a regular expression, for example:
String code = "<div> style=\"width: 3%\" </div>"
String replaced = code.replaceFirst("width: \\d+", "width: 400")
To extract the value in the existing string:
Pattern pattern = Pattern.compile("width: (\\d+?)%");
Matcher matcher = pattern.matcher(code);
matcher.find()
matcher.group(1)//Gives 3
The best approach would be using HTML parser. But if your string will always be simple, you can use replaceAll which takes a regex:
String code = "<div> style=\"width: 3%\" </div>";
String res = code.replaceAll(yourRegex, replacement);
I will leave the full solution for you, but will give you few hints:
String#replaceAll\d+ will match digits, so width:\s+\d+ will match "width" followed by space(s) and then digit(s)width:\s+(\d+) will catch the result of the digits (group)If your String it's:
String code = "<div> style="width: 3%" </div>"
You can find the position in which the % it's stored, like this:
int position = code.indexOf("%");
And suppossing that you have your number stored in a String:
String number = "2";
Note: It doesn't matter if it is 2 or 22 or 222.
You can get the total String with substring function:
String totalString = code.substring(0,position - 1) + number + code.substring(position+1, code.length());
And now you can print it normally:
System.out.println(totalString);
I expect it will works for you!
Use String#replaceFirst or String#replaceAll method: http://docs.oracle.com/javase/7/docs/api/java/lang/String.html
code = code.replaceFirst("width: ?(.*)%", "width: 400%");
Of course adapt the regex to your requirement
You can use HTML parser such as Jsoup.
