java 正则表达式,获取数字和运算符怎么写?

Question

java 正则表达式,获取数字和运算符怎么写?

Answer 1

String str="-dfd34/34";
Pattern pattern=Pattern .compile("\\-|\\+|\\*|\/|\\d");
Matcher matcher=pattern.matcher(str);
while(matcher.find())
{
System.out.println(str.substring(matcher.start(),matcher.end()));

}

Answer 2

var regex = /^([\d])/;
if(regex.test("字符串")){
return true;
}
else{
return false;
}