使用正则expression式获取string模式的索引

我想search一个特定模式的string。

正则expression式类是否提供了string中模式的位置（string内的索引）？
可以有更多的模式1发生。
任何实际的例子？

Answer 1

使用匹配器 ：

public static void printMatches(String text, String regex) { Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(text); // Check all occurrences while (matcher.find()) { System.out.print("Start index: " + matcher.start()); System.out.print(" End index: " + matcher.end()); System.out.println(" Found: " + matcher.group()); } } 

Answer 2

Jean Logeart的特别版答案

 public static int[] regExIndex(String pattern, String text, Integer fromIndex){ Matcher matcher = Pattern.compile(pattern).matcher(text); if ( ( fromIndex != null && matcher.find(fromIndex) ) || matcher.find()) { return new int[]{matcher.start(), matcher.end()}; } return new int[]{-1, -1}; } 

Answer 3

 import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexMatches { public static void main( String args[] ){ // String to be scanned to find the pattern. String line = "This order was places for QT3000! OK?"; String pattern = "(.*)(\\d+)(.*)"; // Create a Pattern object Pattern r = Pattern.compile(pattern); // Now create matcher object. Matcher m = r.matcher(line); if (m.find( )) { System.out.println("Found value: " + m.group(0) ); System.out.println("Found value: " + m.group(1) ); System.out.println("Found value: " + m.group(2) ); } else { System.out.println("NO MATCH"); } } } 

结果

 Found value: This order was places for QT3000! OK? Found value: This order was places for QT300 Found value: 0