Java 正则表达式 - 字符类 [a-zA-Z] 匹配
描述
字符类 [a-zA-Z] 匹配从 a 到 z 或 A 到 Z 的任何字符。
示例
下面的例子展示了字符类匹配的用法。
package com.tutorialspoint; import java.util.regex.Matcher; import java.util.regex.Pattern; public class CharacterClassDemo { private static final String REGEX = "[a-zA-Z]"; private static final String INPUT = "dbcabca124ADCbc"; public static void main(String[] args) { // create a pattern Pattern pattern = Pattern.compile(REGEX); // get a matcher object Matcher matcher = pattern.matcher(INPUT); while(matcher.find()) { //Prints the start index of the match. System.out.println("Match String start(): "+matcher.start()); } } }
让我们编译并运行上面的程序,这将产生以下结果 −
Match String start(): 0 Match String start(): 1 Match String start(): 2 Match String start(): 3 Match String start(): 4 Match String start(): 5 Match String start(): 6 Match String start(): 10 Match String start(): 11 Match String start(): 12 Match String start(): 13 Match String start(): 14