regex - Extract certain substring in Java

Question

I have a sentence, which is:

User update personal account ID from P150567 to A250356.

I want to extract the keywords "P10567" from this sentence.

How do I extract data between the sentence using regex or string method?

Answer 1

• String method:

  Use StringUtils.substringBetween() of Apache Commons:

  public static void main(String[] args) {
      String sentence = "User update personal account ID from P150567 to A250356.";
      String id = StringUtils.substringBetween(sentence, "from ", " to");
      System.out.println(id);
  }
  

• Regex method:

  Use regex from (.*) to, the string surrounded by parentheses is called group(1), just extract it:

  public static void main(String[] args) {
      String regex = "from (.*) to";
      String sentence = "User update personal account ID from P150567 to A250356.";
      Pattern pattern = Pattern.compile(regex);
      Matcher matcher = pattern.matcher(sentence);
      matcher.find();
      System.out.println(matcher.group(1));
  }