java 正则表达式基础，实例学习资料收集大全[原(3)

//查找以Java开头,任意结尾的字符串 Pattern pattern = Pattern.compile("^Java.*"); Matcher matcher = pattern.matcher("Java不是人"); boolean b = matcher.matches(); //当条件满足时，将返回true，否则返回false System.out.println(b);

以多条件分割字符串时

Pattern pattern = Pattern.compile("[, |]+"); String[] strs = pattern.split("Java Hello World Java,Hello,,World|Sun"); for (int i=0;i<strs.length;i++) { System.out.println(strs[i]); }

文字替换（首次出现字符）

Pattern pattern = Pattern.compile("正则表达式"); Matcher matcher = pattern.matcher("正则表达式 Hello World,正则表达式 Hello World"); //替换第一个符合正则的数据 System.out.println(matcher.replaceFirst("Java"));

文字替换（全部）

Pattern pattern = Pattern.compile("正则表达式"); Matcher matcher = pattern.matcher("正则表达式 Hello World,正则表达式 Hello World"); //替换第全部符合正则的数据 System.out.println(matcher.replaceAll("Java"));

文字替换（置换字符）

Pattern pattern = Pattern.compile("正则表达式"); Matcher matcher = pattern.matcher("正则表达式 Hello World,正则表达式 Hello World "); StringBuffer sbr = new StringBuffer(); while (matcher.find()) { matcher.appendReplacement(sbr, "Java"); } matcher.appendTail(sbr); System.out.println(sbr.toString());

验证是否为邮箱地址

String str="ceponline@yahoo.com.cn"; Pattern pattern = Pattern.compile("[\\w\\.\\-]+@([\\w\\-]+\\.)+[\\w\\-]+",Pattern.CASE_INSENSITIVE); Matcher matcher = pattern.matcher(str); System.out.println(matcher.matches());

去除html标记

Pattern pattern = Pattern.compile("<.+?>", Pattern.DOTALL); Matcher matcher = pattern.matcher("<a href=https://www.jb51.net/article/\"index.html\">主页</a>"); String string = matcher.replaceAll(""); System.out.println(string);

查找html中对应条件字符串

Pattern pattern = Pattern.compile("href=https://www.jb51.net/article/\"(.+?)\""); Matcher matcher = pattern.matcher("<a href=https://www.jb51.net/article/\"index.html\">主页</a>"); if(matcher.find()) { System.out.println(matcher.group(1)); }

截取地址//截取url

Pattern pattern = Pattern.compile("(|https://){1}[\\w\\.\\-/:]+"); Matcher matcher = pattern.matcher("dsdsds<>fdf"); StringBuffer buffer = new StringBuffer(); while(matcher.find()){ buffer.append(matcher.group()); buffer.append("\r\n"); System.out.println(buffer.toString()); }

替换指定{}中文字

String str = "Java目前的发展史是由{0}年-{1}年"; String[][] object={new String[]{"\\{0\\}","1995"},new String[]{"\\{1\\}","2007"}}; System.out.println(replace(str,object)); public static String replace(final String sourceString,Object[] object) { String temp=sourceString; for(int i=0;i<object.length;i++) { String[] result = (String[]) object[i]; Pattern pattern = Pattern.compile(result[0]); Matcher matcher = pattern.matcher(temp); temp = matcher.replaceAll(result[1]); } return temp; }

以正则条件查询指定目录下文件 //用于缓存文件列表

private ArrayList files = new ArrayList(); // 用于承载文件路径 private String _path; // 用于承载未合并的正则公式 private String _regexp; class MyFileFilter implements FileFilter { /** * 匹配文件名称 */ public boolean accept(File file) { try { Pattern pattern = Pattern.compile(_regexp); Matcher match = pattern.matcher(file.getName()); return match.matches(); } catch (Exception e) { return true; } } } /** * 解析输入流 * @param inputs */ FilesAnalyze(String path, String regexp) { getFileName(path, regexp); } /** * 分析文件名并加入files * @param input */ private void getFileName(String path, String regexp) { // 目录 _path = path; _regexp = regexp; File directory = new File(_path); File[] filesFile = directory.listFiles(new MyFileFilter()); if (filesFile == null) return; for (int j = 0; j < filesFile.length; j++) { files.add(filesFile[j]); } return; } /** * 显示输出信息 * @param out */ public void print(PrintStream out) { Iterator elements = files.iterator(); while (elements.hasNext()) { File file = (File) elements.next(); out.println(file.getPath()); } } public static void output(String path, String regexp) { FilesAnalyze fileGroup1 = new FilesAnalyze(path, regexp); fileGroup1.print(System.out); } public static void main(String[] args) { output("C:\\", "[A-z|.]*"); }

基本上就这些了，原来的内容确实太烂了，这次更新了一下。

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