JAVA正则表达式
java处理文本文件时经常用到字符串匹配处理，那么正则表达式无疑是最佳选择其实正则表达式的使用非常简单，关键是正则表达式的编写，正则表达式参见http://twb.iteye.com/blog/196682
下面写一下java正则表达式的处理，已备日后查阅
import java.util.regex.Matcher;import java.util.regex.Pattern;public class Test { public void PatternTest() {String exp = "<td.*?>";Pattern p = Pattern.compile(exp);String s = "<td colspan=\"6\" class=\"pi\">05323111094ajsall look</td><td colspan=\"6\" class=\"pi\">05323111094ajsall look</td>";Matcher matcher = p.matcher(s);while (matcher.find()) { String str = ""; String result = matcher.group(); int c = s.indexOf("colspan"); if (c != -1) { str = " " + s.substring(c, c + 11); } s = s.replace(result , "<td" + str + ">");}System.out.println(s); } public static void main(String args[]) {Test t = new Test();t.PatternTest(); }}运行结果为：
<td colspan="6">05323111094ajsall look</td><td colspan="6">05323111094ajsall look</td> exp 正则表达式，
Pattern p = Pattern.compile(exp);//编译正则表达式
Matcher matcher = p.matcher(s);//匹配字符串
matcher.find() //匹配结果，如果有匹配结果返回true，否则返回false
matcher.group() //返回匹配到的字符串
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