java正则表达式验证汉字详解编程语言

统计指定内容的汉字个数：

String str = "北京欢迎你 hello welcome!"; 
int count=0; 
Pattern pattern = Pattern.compile("[/u4e00-/u9fa5]"); 
char c[] = str.toCharArray(); 
for(int i=0;i<c.length;i++){ 
	Matcher matcher = pattern.matcher(String.valueOf(c[i])); 
	if(matcher.matches()){ 
		count++; 
	} 
} 
System.out.println(count);