Java正则表达式工具方法汇总

1.获取某字符串中汉字的个数

... private int getChineseCount(String text) { String Reg = '^[u4e00-u9fa5]{1}$';// 正则 int result = 0; for (int i = 0; i < text.length(); i++) { String b = Character.toString(text.charAt(i)); if (b.matches(Reg))result++; } return result; }...

2.使用正则替换某字符串中所有符合正则的字符串为指定字符串

//将str中的符合正则regu的字符串替换成replaceStr... private static String replace(String str, String regu, String replaceStr) { Pattern pattern = Pattern.compile(regu); Matcher matcher = pattern.matcher(str); str = matcher.replaceAll(replaceStr); return str; }...

3.驼峰式转换成大写下划线

... private String humpToLine(String str) { Pattern humpPattern = Pattern.compile('[A-Z]'); Matcher matcher = humpPattern.matcher(str); StringBuffer sb = new StringBuffer(); while (matcher.find()) { matcher.appendReplacement(sb, '_' + matcher.group(0).toLowerCase()); } matcher.appendTail(sb); return sb.toString().toUpperCase(); }...

4.大写下划线转换成驼峰式

... private String lineToHump(String str) { Pattern linePattern = Pattern.compile('_(w)'); str = str.toLowerCase(); Matcher matcher = linePattern.matcher(str); StringBuffer sb = new StringBuffer(); while (matcher.find()) { matcher.appendReplacement(sb, matcher.group(1).toUpperCase()); } matcher.appendTail(sb); return sb.toString(); }...

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