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  1. import java.util.Objects;
  2. import java.util.regex.Matcher;
  3. import java.util.regex.Pattern;
  4.  
  5. class Ideone {
  6.   public static void main(String[] args) {
  7.     final Pattern pattern = Pattern.compile(
  8.         "\\b(?<!\\.)(?<number>\\d{1,4})(?:(\\.\\d{1,2})?)(?<unit> ml)\\b",
  9.         Pattern.CASE_INSENSITIVE);
  10.  
  11.     final Matcher matcher = pattern.matcher("5432 ml");
  12.     final Matcher matcher2 = pattern.matcher("54321 ml");
  13.     final Matcher matcher3 = pattern.matcher("1234.0 ml");
  14.     final Matcher matcher4 = pattern.matcher("Start 12345.0 ml end");
  15.  
  16.     final String result = matcher.find()
  17.         ? matcher.group("number") + matcher.group("unit")
  18.         : "";
  19.     final String result2 = matcher2.find()
  20.         ? matcher2.group("number") + matcher2.group("unit")
  21.         : "";
  22.     final String result3 = matcher3.find()
  23.         ? matcher3.group("number") + matcher3.group("unit")
  24.         : "";
  25.     final String result4 = matcher4.find()
  26.         ? matcher4.group("number") + matcher4.group("unit")
  27.         : "";
  28.  
  29.     System.out.println(Objects.equals(result, "5432 ml"));
  30.     System.out.println(Objects.equals(result2, ""));
  31.     System.out.println(Objects.equals(result3, "1234 ml"));
  32.     System.out.println(Objects.equals(result4, ""));
  33.   }
  34. }
Success #stdin #stdout 0.1s 54664KB
comments (?)
stdin 
Standard input is empty
stdout 
true
true
true
true
https://ideone.com/kamVlg
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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