计算 Java 正则表达式中的组数
可以通过将多个字符组合成组对其进行捕获,将多个字符视为一个单独的单元。只需将这些字符放在一对括号中即可。
可以使用 Matcher 类的 groupCount() 方法计算当前匹配中的组数。此方法计算当前匹配中捕获的组数并返回该值。
示例
import java.util.regex.Matcher; import java.util.regex.Pattern; public class Test { public static void main(String[] args) { String str1 = "<p>This <b>is</b> an <b>example</b> HTML <b>script</b> where <b>ever</b> alternative <b>word</b> is <b>bold</b></p>."; //Regular expression to match contents of the bold tags String regex = "(t(\S+)t)(\s)"; String str = "the words tit tat tweet tostff tact that tilt text. start and end with the letter t "; //Creating a pattern object Pattern pattern = Pattern.compile(regex); //Matching the compiled pattern in the String Matcher matcher = pattern.matcher(str); while (matcher.find()) { System.out.println(matcher.group(0)); } System.out.println("Total capturing groups: "+matcher.groupCount()); } }
输出
tit tat tweet tact that tilt text tart Total capturing groups: 3
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