Posted on 2008-05-04 09:59
G_G 閱讀(2269)
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javaGeneral
這就不介紹了 代碼上：
package?unit;
import?java.util.regex.Matcher;
import?java.util.regex.Pattern;
import?org.junit.Assert;
import?org.junit.Test;
public?class?RegexUnit?{
????@Test
????/**
?????*?<p>向前\向后查找</p>
?????*/
????public?void?unit9()throws?Exception{
????????String?testStr?=?"http://www.google.com";
????????
????????/*?一般查找
?????????*?.+(:)?查詢出結(jié)果包含?:
?????????*/
????????Pattern?pattern?=?Pattern.compile(".+(:)");????????
????????Matcher?matcher?=??pattern.matcher(testStr);
????????????Assert.assertTrue("錯(cuò)誤：?查找出結(jié)果通過?.+(:)?此regex沒有包含?:?",
????????????????????matcher.find()?&&?matcher.group().equals("http:")?);
????????
????????/*??向前查找
?????????*??.+(?=:)?查詢結(jié)果不包含?:
?????????*/
????????Pattern?pattern2?=?Pattern.compile(".+(?=:)");
????????Matcher?matcher2?=?pattern2.matcher(testStr);
????????????Assert.assertTrue("錯(cuò)誤：?查找出結(jié)果通過?.+(?=:)?此regex有包含?:?",
????????????????????matcher2.find()&&?matcher2.group().equals("http"));
????????/*?向后查找
?????????*?(?<=:).+
?????????*/
????????Pattern?pattern3?=?Pattern.compile("(?<=://).+");
????????Matcher?matcher3?=?pattern3.matcher(testStr);
????????????Assert.assertTrue("錯(cuò)誤：查找出結(jié)果包含?http://?不向后查詢",
????????????????????matcher3.find()&&?matcher3.group().equals("www.google.com")?);
????}
????@Test
????/**?回朔應(yīng)用?
?????*??查詢回朔、回朔替換、回朔大小寫替換
?????*/
????public?void?unit8()throws?Exception{
????????String?testStr?=?"this?is?a?block?of?of?test,"+
????????????????????????????"?several?words?here?are?are?"?+
????????????????????????????"?repeated?,?and?and?they?should?not?be.?";
????????
????????Pattern?pattern?=?Pattern.compile("[?]+(\\w+)[?]+\\1");
????????Matcher?matcher?=?pattern.matcher(testStr);
????????//查詢結(jié)果?are?are?
????????Assert.assertTrue("錯(cuò)誤：regex?不匹配?",?
????????????????matcher.find()&&matcher.group().split("?").length>=2?);
????????
????????while(?matcher.find()?){
????????????Assert.assertTrue("錯(cuò)誤：regex?不匹配?",?
????????????????????matcher.group().split("?").length>=2?);
????????}
????????
????????
????????//替換
????????String?testStr2s?=?"313-555-1234";
????????Pattern?pattern2?=?Pattern.compile("(\\d{3})(-)(\\d{3})(-)(\\d{4})");
????????Matcher?mtmp?=??pattern2.matcher(testStr2s);
????????Assert.assertTrue("錯(cuò)誤：沒有查替換",
????????????????mtmp.find()?&&?
????????????????????mtmp.replaceAll("($1)?$3-$5").equals("(313)?555-1234")?);
????????
????????
????????/*大小寫替換(java?不能成功)
?????????*??\E?結(jié)束?\L?或?\U轉(zhuǎn)換
?????????*??\l??\L?把下一個(gè)字符(串)換為小寫
?????????*??\?u??\U?把下一個(gè)字符(串)轉(zhuǎn)換為大寫
??? ?? ? *? 此中 (.*?)懶散加載
?????????*/
????????String?testStr3?=?"tt:google:xx";
????????Pattern?pattern3?=?Pattern.compile("(?<=:)(.*?)(?=:)");
????????Matcher?matcher2?=?pattern3.matcher(testStr3);
????????if(?matcher2.find())
????????????System.out.println(?matcher2.group()?)?;
????}
????
????
}