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;}