在Java中，我应该使用哪种正则表达式来检查仅包含数字和2个特殊字符（-和，）的字符串？

Question

Scenario : I want to check whether string contains only numbers and 2 predefined special characters, a dash and a comma.

My string contains numbers (0 to 9) and 2 special characters: a dash ( - ) defines a range and a comma ( , ) defines a sequence.

Tried attempt : Tried following regex [0-9+-,]+ , but not working as expected.

Possible inputs :

1-5
1,5
1-5,6
1,3,5-10
1-5,6-10
1,3,5-7,8,10

The regex should not accept these types of strings:

-----
1--4
,1,5
5,6,
5,4,-
5,6-
-5,6

Please can any one help me to create regex for above scenario?

Answer 1

You may use

^\d+(?:-\d+)?(?:,\d+(?:-\d+)?)*$

See the regex demo

Regex details :

• ^ - start of string
• \\d+ - 1 or more digits
• (?:-\\d+)? - an optional sequence of - and 1+ digits
• (?:,\\d+(?:-\\d+)?)* - zero or more seuqences of:
  • , - a comma
  • \\d+(?:-\\d+)? - same pattern as described above
• $ - end of string.

Answer 2

Change your regex [0-9+-,]+ to [0-9,-]+

final String patternStr = "[0-9,-]+";
final Pattern p = Pattern.compile(patternStr);
String data = "1,3,5-7,8,10";
final Matcher m = p.matcher(data);
if (m.matches()) {
System.out.println("SUCCESS");
}else{
System.out.println("ERROR");
}