Какое регулярное выражение или шаблон следует использовать для извлечения следующего содержимого из текстового файла?

#java #pattern-matching

#java #сопоставление с образцом

Вопрос:

Мне нужно разделить текст, начиная с «9 = DEXTER» до следующего «9 = DEXTER». Как написать регулярное выражение шаблона для него в java. использование end of the line не работает, поскольку некоторая фраза слилась с предыдущей строкой фразы.

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132157:8473:OUT 20130408-22:27:59.611 : 9=DEXTER.1.19=13213035=X49=PARFX56=c3_user134=847352=20130408-22:27:59.611262=aquru2D00000002268=1509279=2269=055=EUR/CHF270=27379.5271=01023=598336=3346=0273=22:27:23.084279=0269=055=EUR/CHF270=27396.49271=440000001023=414336=3346=1273=22:27:23.0848722=0279=2269=055=EUR/CHF270=27404.86271=01023=305336=3346=0273=22:27:23.085279=0269=055=EUR/CHF270=27374.86271=400000001023=668336=3346=1273=22:27:23.0858722=0279=2269=055=EUR/CHF270=27416.14271=01023=174336=3346=0273=22:27:23.085279=2269=055=EUR/CHF270=27411.65271=01023=233336=3346=0273=22:27:23.085279=0269=055=EUR/CHF270=27363.95271=440000001023=808336=3346=1273=22:27:23.0858722=0279=2269=055=EUR/CHF270=27408.47271=01023=262336=3346=0273=22:27:23.098279=0269=055=EUR/CHF270=27400.23271=410000001023=371336=3346=1273=22:27:23.098
 

Комментарии:

1. Почему бы просто не использовать String.indexOf and String.substring ?

2. такой текст повторяется в текстовом файле около 20000 раз.

3. какой ожидаемый результат вы хотите?

Ответ №1:

Вот простое регулярное выражение, которое сделает это:

9=DEXTER((?s:.)*?)((?=9=DEXTER)|$)

В основном захватывает группу ((?s:.)*?) между a 9=DEXTER ИЛИ end of file ( $ )

 String regex = "9=DEXTER((?s:.)*?)((?=9=DEXTER)|$)";
String text = "9=DEXTERHello9=DEXTERworldnnewline9=DEXTERfoo9=DEXTERbar";

Pattern pattern = Pattern.compile(regex);
Matcher m = pattern.matcher(text);
while (m.find()) {
    String s = m.group(1);
    System.out.println(":" s);
}
 

вывод:

 :Hello
:world
new line
:foo
:bar