正则表达式及应用

工具类：UbbToHtml.java

package com.steven.helper;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class UbbToHtml {
        // 将ubb标签语言转成html
        public static String convertUbbToHtml(String str) {
                str = convertAngleTag(str);
                str = convertCommentTag(str);
                str = convertColorTag(str);
                str = convertImgTag(str);
                str = convertFieldsTag(str);
                str = convertKeywordsTag(str);
                str = convertJavaTag(str);
                str = convertOtherTag(str);
                return str;
        }

        // 将[code=img]和[/code]标签转成html
        public static String convertImgTag(String str) {
                if (str == null || str.length() == 0) {
                        return str;
                }
                String regexp = "(\[code=img\])([^\[]+)(\[/code\])";
                Pattern pattern = Pattern.compile(regexp);
                Matcher match = pattern.matcher(str);
                StringBuffer sb = new StringBuffer(); 
                boolean result = match.find();
                while (result) {
                        match.appendReplacement(sb, "<img src="file:///android_asset/" + match.group(2) + "" width=‘230dp‘>");
                        result = match.find();
                }
                //match.appendTail(sb);
                return sb.toString();
        }

        // 将[code=java]和[/code]标签转成html
        public static String convertJavaTag(String str) {
                if (str == null || str.length() == 0) {
                        return str;
                }
                String regexp = "(\[code=java\])
?([\s\S]+?)(\[/code\])";
                Pattern pattern = Pattern.compile(regexp);
                Matcher match = pattern.matcher(str);
                StringBuffer sb = new StringBuffer();
                boolean result = match.find();
                while (result) {
                        match.appendReplacement(sb, "<div style=‘border:solid 1px #bbb;background:#eee;padding:8; margin:10 0 10 0;‘>" + match.group(2) + "</div>");
                        result = match.find();
                }
                match.appendTail(sb);
                return sb.toString();
        }

        // 将[color=blue]标签转成html
        public static String convertColorTag(String str) {
                if (str == null || str.length() == 0) {
                        return str;
                }
                String regexp = "(\[color=blue\])([^\s]+)([\s]+?)";
                Pattern pattern = Pattern.compile(regexp);
                Matcher match = pattern.matcher(str);
                StringBuffer sb = new StringBuffer();
                boolean result = match.find();
                while (result) {
                        match.appendReplacement(sb,"<div style=‘color:blue;margin:10 0 10 0;font-weight:bolder;‘>" + match.group(2) + "</div>");
                        result = match.find();
                }
                match.appendTail(sb);
                return sb.toString();
        }

        // 将#[Fields]标签转成html
        public static String convertFieldsTag(String str) {
                if (str == null || str.length() == 0) {
                        return str;
                }
                String regexp = "(#\[Fields\])([^#]+?)#";
                Pattern pattern = Pattern.compile(regexp);
                Matcher match = pattern.matcher(str);
                StringBuffer sb = new StringBuffer();
                boolean result = match.find();
                while (result) {
                        match.appendReplacement(sb,"<span style=‘color:red;‘>" + match.group(2) + "</span>");
                        result = match.find();
                }
                match.appendTail(sb);
                return sb.toString();
        }

        // 将#[Keywords]标签转成html
        public static String convertKeywordsTag(String str) {
                if (str == null || str.length() == 0) {
                        return str;
                }
                String regexp = "(#\[Keywords\])(\w+[\s]?)";
                Pattern pattern = Pattern.compile(regexp);
                Matcher match = pattern.matcher(str);
                StringBuffer sb = new StringBuffer();
                boolean result = match.find();
                while (result) {
                        match.appendReplacement(sb,"<span style=‘color:#900;‘>" + match.group(2) + "</span>");
                        result = match.find();
                }
                match.appendTail(sb);
                return sb.toString();
        }

        // 将#[Comments]标签转成html
        public static String convertCommentTag(String str) {
                if (str == null || str.length() == 0) {
                        return str;
                }
                String regexp = "(#\[Comments\]//)([^#]+)";
                Pattern pattern = Pattern.compile(regexp);
                Matcher match = pattern.matcher(str);
                StringBuffer sb = new StringBuffer();
                boolean result = match.find();
                while (result) {
                        match.appendReplacement(sb, "<div>//" + match.group(2) + "</div>");
                        result = match.find();
                }
                match.appendTail(sb);
                return sb.toString();
        }

        // 将
换行标签及其他标签转成html
        public static String convertOtherTag(String str) {
                str = str.replaceAll("#\}", "<br/>}");
                str = str.replaceAll("#", "");
                str = str.replaceAll("
", "<br/>");
                return str;
        }

        // 将左尖括号和右尖括号转成实体符号&lt;和&gt;。在html标签语言中，“<”和“>”会被认为是html标记。因此要先将其替换。
        public static String convertAngleTag(String str) {
                str = str.replaceAll("<", "&lt;");
                str = str.replaceAll(">", "&gt;");
                return str;
        }
}

//调用页面只需要调用：String newStr = UbbToHtml.convertUbbToHtml(需要替换的字符串); 即可。