JAVA中正則表達(dá)式匹配，替換，查找，切割的方法

2020-03-24 18:57:01

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str.split((1)//.+)按照字符串中含有2個(gè)字符或以上的地方截取(1)表示分組為1截取的例子;按照分組截取;截取的位置在兩個(gè)或兩個(gè)以上的地方String str = "publichtml' target='_blank'>staticccvoidddmain"; //對(duì)表達(dá)式進(jìn)分組重用 String ragex1="(.)//1+"; String[] ss = str.split(ragex1); for(String st:ss){ System.out.println(st); //按照兩個(gè)cc+來(lái)截取String ragex = " "; //切割 String strs = "publicstaticccvoidddmain"; String ragexs = "cc+"; String[] s = strs.split(ragexs); for(String SSSS :s){ System.out.println(SSSS); System.out.println("=-=========");正則表達(dá)式中的替換;語(yǔ)法定義規(guī)則;String s =str.replaceAll(ragex, newstr);字符串中的替換是replace();將4個(gè)或4個(gè)以上的連續(xù)的數(shù)字替換成*// 替換 String str="wei232123jin234"; String ragex = "http://d{4,}"; String newstr = "*"; String s =str.replaceAll(ragex, newstr); System.out.println(s);將重復(fù)的字符串換成一個(gè)*String str ="wwweiei222222jjjiiinnn1232"; String ragex ="(.)//1+"; String newStr ="*"; String s = str.replaceAll(ragex, newStr); System.out.println(s);將我...我...要..要.吃...吃...飯換成我要吃飯String str = "我...我...要..要.吃...吃...飯"; String regex = "http://.+"; String newStr = ""; str=test(str, regex, newStr); regex = "(.)//1+"; newStr = "$1"; test(str, regex, newStr);public static String test(String str, String regex, String newStr) { String str2 = str.replaceAll(regex, newStr); System.out.println(str2); return str2; }正則表達(dá)式的字符串的獲取1,根據(jù)定義的正則表達(dá)式創(chuàng)建Pattern對(duì)象2,使用Pattern對(duì)象類匹配3,判斷是否為true4,加入到組例子;String str = "public static void main(String[] args)" + " public static void main(String[] args)public static void main(String[] args)"; String ragex = "http://b[a-zA-Z]{4,5}//b"; Pattern p =Pattern.compile(ragex); Matcher m = p.matcher(str); while(m.find()){ String s = m.group(); System.out.println(s); }作業(yè):1,獲取 html user /user 中的userString str =" html user /html String regex = " html | /html String newStr = ""; String str2 = str.replaceAll(regex, newStr);System.out.println(str2);2,獲取dhfjksaduirfn 11@qq.com dsjhkfa wang@163.com wokaz中的郵箱號(hào)碼String regex = " "; String[] strs=str.split(regex); for(String str2:strs){ String ragexDemo = "[a-zA-Z0-9]([a-zA-Z0-9]*[-_] [a-zA-Z0-9]+)*" + "@([a-zA-Z0-9]+)//.[a-zA-Z]+//. [a-zA-Z]{0,2}";Pattern p = Pattern.compile(ragexDemo);Matcher m = p.matcher(str2);while(m.find()){System.out.println(m.group()); }示例代碼：import java.util.ArrayList;import java.util.regex.Matcher;import java.util.regex.Pattern;public class test { public static void main(String[] args) { getStrings(); //用正則表達(dá)式獲取指定字符串內(nèi)容中的指定內(nèi)容 System.out.println("********************"); replace(); //用正則表達(dá)式替換字符串內(nèi)容 System.out.println("********************"); strSplit(); //使用正則表達(dá)式切割字符串 System.out.println("********************"); strMatch(); //字符串匹配 private static void strMatch() { String phone = "13539770000"; //檢查phone是否是合格的手機(jī)號(hào)(標(biāo)準(zhǔn):1開(kāi)頭，第二位為3,5,8，后9位為任意數(shù)字) System.out.println(phone + ":" + phone.matches("1[358][0-9]{9,9}")); //true String str = "abcd12345efghijklmn"; //檢查str中間是否包含12345 System.out.println(str + ":" + str.matches("http://w+12345//w+")); //true System.out.println(str + ":" + str.matches("http://w+123456//w+")); //false private static void strSplit() { String str = "asfasf.sdfsaf.sdfsdfas.asdfasfdasfd.wrqwrwqer.asfsafasf.safgfdgdsg"; String[] strs = str.split("http://."); for (String s : strs){ System.out.println(s); private static void getStrings() { String str = "rrwerqq84461376qqasfdasdfrrwerqq84461377qqasfdasdaa654645aafrrwerqq84461378qqasfdaa654646aaasdfrrwerqq84461379qqasfdasdfrrwerqq84461376qqasfdasdf"; Pattern p = Pattern.compile("qq(.* )qq"); Matcher m = p.matcher(str); ArrayList String strs = new ArrayList String while (m.find()) { strs.add(m.group(1)); for (String s : strs){ System.out.println(s); private static void replace() { String str = "asfas5fsaf5s4fs6af.sdaf.asf.wqre.qwr.fdsf.asf.asf.asf"; //將字符串中的.替換成_，因?yàn)?是特殊字符，所以要用/.表達(dá)，又因?yàn)?是特殊字符，所以要用//.來(lái)表達(dá). str = str.replaceAll("http://.", "_"); System.out.println(str); }PHP教程

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