正则表达式

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public class StringUtil {/** * 去除字符串中的特殊字符 *  * @param string * @return */public static String clean(String string) {String regEx = "[^A-Za-z\\d\\u4E00-\\u9FA5]+";return clean(string, regEx);}public static String clean(String string, String regEx) {Pattern pattern = Pattern.compile(regEx);Matcher matcher = pattern.matcher(string);return matcher.replaceAll("").trim();}/** * 返回所有匹配的字符串 *  * @param regEx *            正则表达式 * @param string */public static List<String> getMatchedStrings(String regEx, String string) {List<String> result = new ArrayList<String>();Pattern pattern = Pattern.compile(regEx);Matcher matcher = pattern.matcher(string);while (matcher.find()) {result.add(matcher.group());}return result;}/** * 检查是否为所需格式 *  * @param string * @return */public static boolean isValid(String string) {String regEx = "[A-Za-z\\d\\u4E00-\\u9FA5]+";return isValid(string, regEx);}public static boolean isValid(String string, String regEx) {Pattern pattern = Pattern.compile(regEx);Matcher matcher = pattern.matcher(string);if (matcher.matches()) {return true;}return false;}}

常用JavaScript正则表达式

/*邮箱*//^[a-zA-Z]+[a-zA-Z0-9\._]+@\w+\.[a-z]+$//*数字（正负数、小数）*//^[\+-]?\d|[\+-]?\d+\.\d+$//*数字、字母和汉字*//^[A-Za-z\d\u4E00-\u9FA5]*$//*IPV4*//^(([1-9]|([1-9]\d)|(1\d\d)|(2([0-4]\d|5[0-5])))\.)(([1-9]|([1-9]\d)|(1\d\d)|(2([0-4]\d|5[0-5])))\.){2}([1-9]|([1-9]\d)|(1\d\d)|(2([0-4]\d|5[0-5])))$/