java 中的正则表达式在 n 个字符后打印

Question

I am writing java code to print something between two expressions.

My file from where I am reading is:

 CAL|AB12345|hi, how are you }

my java code:

final Pattern pattern = Patter.compile("CAL|AB[0-9]{5}|(.+?)}", Pattern.DOTALL);
final Matcher matcher = pattern.matcher(filename);
while (matcher.find()) {
 String a = matcher.group(0);
  System.out.println(a);}

I want the output to be:

hi, how are you

ALso, how can i calculate the number of characters for example if i want to print after 9 characters after CAL, it will also work.

Answer 1

you can modify your code like this:

public static void main(String []args){

    final Pattern pattern = Pattern.compile("(CAL\\|AB[0-9]{5}\\|)([a-zA-Z0-9,><@#\\s]+)(})");
    final Matcher matcher = pattern.matcher("CAL|AB12345|hi, how are you }");

    String a;
    while (matcher.find()) {
         a = matcher.group(2);

        System.out.println(a);}
}
}

OUTPUT

 hi, how are you

Hint: for 9 characters part,you can start substring from that index count

Hope it helps !