There is a line:
random_ 123 _text 456 random_text_end Please tell random_ 123 _text what the regular expression will be for searching 456 in this line if it is not known: will there be random_ 123 _text and will there be random_text_end ? The main condition is that the desired number is the last in the string, and anything can be either before or after.
Thank.
You can simply search through the last entry:
//Основной метод приложения public static void main(String[] args) throws IOException { String text = "random_ 123 _text 456 random_text_end"; Pattern pattern = Pattern.compile("(\\d+)"); Matcher matcher = pattern.matcher(text); String result = null; while (matcher.find()){ result = matcher.group(0); } //Тут обрабатываем результат String resultHandler = result; //result = "456" } 
The cycle will work, but it can be solved with one expression: (\d+)[^\d]*$ (a group of numbers, after which the numbers do not occur until the end of the line).
In Java it will look like this:
String text = "random_ 123 _text 456 random_text_end"; Pattern pattern = Pattern.compile("(\\d+)[^\\d]*$"); Matcher matcher = pattern.matcher(text); //если цифр в строке нет, то будет null. String result = matcher.find() ? matcher.group(1) : null; 
Source: https://ru.stackoverflow.com/questions/772541/
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