正则表达式-将搜索结果高亮

模拟：

将要查找的字符串中，指定字符替换为高亮的字符：

方法一：

package com.java.regex;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class HighLight {
    public static void main(String[] args) {
        String keyword = "a";
        String regexp = keyword + "+";
        String name = "啊abfac是的Aaa爱的的a我要是alkja卡和户A玉玉aaa很快就asa啊发A阿达ff";

        Pattern pattern = Pattern.compile(regexp, Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(name);
        StringBuffer sb = new StringBuffer();

        int start = 0;
        int end = 0;
        String temp = "";
        while(matcher.find()){
            start = matcher.start();
            sb.append(name.substring(end, start));
            temp = "<i class=\"highlight\">"+matcher.group()+"</i>";
            sb.append(temp);
            end = matcher.end();
        }

        sb.append(name.substring(end));

        System.out.println(sb.toString());

    }
}

返回结果：

啊<i class="highlight">a</i>bf<i class="highlight">a</i>c是的<i class="highlight">Aaa</i>爱的的<i class="highlight">a</i>我要是<i class="highlight">a</i>lkj<i class="highlight">a</i>卡和户<i class="highlight">A</i>玉玉<i class="highlight">aaa</i>很快就<i class="highlight">a</i>s<i class="highlight">a</i>啊发<i class="highlight">A</i>阿达ff

方法二：

package com.java.regex;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class HighLight2 {
    public static void main(String[] args) {
        String keyword = "a";
        String regexp = keyword;
        String name = "啊abfac是的Aaa爱的的a我要是alkja卡和户A玉玉aaa很快就asa啊发A阿达ff";

        Pattern pattern = Pattern.compile(regexp, Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(name);
        String resp = matcher.replaceAll("<i class=\"highlight\">"+keyword+"</i>");
        System.out.println(resp);
    }
}

结果：

啊<i class="highlight">a</i>bf<i class="highlight">a</i>c是的<i class="highlight">a</i><i class="highlight">a</i><i class="highlight">a</i>爱的的<i class="highlight">a</i>我要是<i class="highlight">a</i>lkj<i class="highlight">a</i>卡和户<i class="highlight">a</i>玉玉<i class="highlight">a</i><i class="highlight">a</i><i class="highlight">a</i>很快就<i class="highlight">a</i>s<i class="highlight">a</i>啊发<i class="highlight">a</i>阿达ff

但是问题是，将name中的大写的A也替换为小写了。

方法三：

package com.java.regex;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class HighLight3 {
    public static void main(String[] args) {
        String keyword = "a";
        String regexp = keyword + "+";
        String name = "啊abfac是的Aaa爱的的a我要是alkja卡和户A玉玉aaa很快就asa啊发A阿达ff";

        Pattern pattern = Pattern.compile(regexp, Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(name);
        StringBuffer sb = new StringBuffer();
        while(matcher.find()){
            matcher.appendReplacement(sb, "<i class=\"highlight\">"+matcher.group()+"</i>");
        }
        matcher.appendTail(sb);

        System.out.println(sb.toString());
    }
}

结果：

啊<i class="highlight">a</i>bf<i class="highlight">a</i>c是的<i class="highlight">Aaa</i>爱的的<i class="highlight">a</i>我要是<i class="highlight">a</i>lkj<i class="highlight">a</i>卡和户<i class="highlight">A</i>玉玉<i class="highlight">aaa</i>很快就<i class="highlight">a</i>s<i class="highlight">a</i>啊发<i class="highlight">A</i>阿达ff

很nice。又简单又快捷

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