字符类[a-zA-Z]匹配从a到z或A到Z的任何字符。
示例
以下示例显示了字符类匹配的用法。
package com.yiibai; 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()); } } }
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
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