How to get the desired character from the multiple underscored variable sized strings?

Question

This is continuation of How to get the desired character from the variable sized strings? but includes additional scenarios from which, a person names are to be extracted

 pot-1_Sam  [Sam is the word to be extracted]
 pot_444_Jack [Jack is the word to be extracted]
 pot_US-1_Sam  [Sam is the word to be extracted]
 pot_RUS_444_Jack[Jack is the word to be extracted]
 pot_UK_3_Nick_Samuel[Nick_Samuel is the word to be extracted]
 pot_8_James_Baldwin[James_Baldwin is the word to be extracted]
 pot_8_Jack_Furleng_Derik[Jack_Furleng_Derik is the word to be extracted]

Above are the Sample words from which the names person names are to be extracted. One thing to note is that The person name will always start after a "Number" and an "Underscore". How to achieve the above using Java?

Answer 1

Use the following regular expression:

^.*\d+_(.*)$

... and extract the value of the 1st group.

Answer 2

String[] strings = {
        "pot-1_Sam",
        "pot_444_Jack",
        "pot_US-1_Sam",
        "pot_RUS_444_Jack",
        "pot_UK_3_Nick_Samuel",
        "pot_8_James_Baldwin",
        "pot_8_Jack_Furleng_Derik"
};

Pattern pattern = Pattern.compile("\\d_(\\w+)$");
for (String s : strings ){
    Matcher matcher = pattern.matcher(s);
    if (matcher.find()) {
        System.out.println(matcher.group(1));
    }
}

Answer 3

Here is the regex: \d_(.*$)

\d stands for one digit

_ stands for underscore

() stands for group

.*$ stands for "all till the end of line"

Answer 4

    String str= "pot_8_Jack_Furleng_Derik";
     // name starts after number and _
    Pattern p = Pattern.compile("\\d+_");
    Matcher m = p.matcher(str);

    int index = -1;
    // find the index of name
    if(m.find())
    index =  m.start()+2;

    str=  str.substring(index);
    System.out.print(str);

Answer 5

You can try using Reflection to get the actual name of the variable as seen here You can further break that down with Regex, as also mentioned