regex启发

// TODO Auto-generated method stub
//1-50 个字符(包括英文大小写字母,数字,英文半角符号_或-)
String data="_javaasdfa123_sdfa-www";
data="Dsdf_d-sdf";
String regex_Str="^[a-zA-Z]{1}([a-zA-Z0-9]|[-_]){0,49}";
boolean result=Pattern.matches(regex_Str,data);
System.out.println(result);