I am trying to check if a range of numbers exist in a string Any more elegant way than this?
if (ccnumeric.contains("51")
|| ccnumeric.contains("52")
|| ccnumeric.contains("53")
|| ccnumeric.contains("54")
|| ccnumeric.contains("55"))
I can't think of any method that satisfies this as I am checking for an int range in a string.
You could use a simple regex: 5[12345]{1} to look for a 5 followed by exactly one 1,2,3,4 or 5:
String s = "55";
Pattern p = Pattern.compile("5[12345]{1}");
if (p.matcher(s).find()) {
System.out.println("Found");
} else {
System.out.println("Not Found");
}
[1-5] instead of [12345]?
Maybe you can try regular expressions.
For instance
Pattern.matches( ".*5[1-5].*", ccnumeric );
Edit: To find all numbers in a string:
List<Integer> allMatches = new ArrayList<Integer>();
Matcher m = Pattern.compile("(\\d+)").matcher(ccnumeric);
while (m.find()) {
allMatches.add(Integer.parse(m.group()));
}
Your question is a bit vague, for instance how many numbers are in the string "541", 1(541), 3(5,4,1), 6(5,4,1,54,41,541)? Depending on how you define that your regexes will change considerably. If your answer is 1, the solution is pretty straightforward, a greedy search for all numbers whose length is the same as your min and less than or equal to your max(you can then parse the matches and filter based on the min and max)...If its one of the others then your solution is going to be a bit more complicated, you are basically going to have to create a sliding window to evaluate all the possible combinations in the string.
I think your question is phrased ambigously... Are you looking to check if the input strings contains a number within the range 51-55? (Your written text seems to imply this) In this case, the string "512 is a power of two" would not be a match, since it does not contain the number 51.
Or are you looking to check that the string contains the character sequence 51, 52, 53, 54 or 55? (Your code seems to imply this) In this case, the string "512 is a power of two" would be a match, since it contains the character sequence 51.
If the first option is the case, then you'd need something like:
Pattern p = Pattern.compile("(^|[^\\d])5[1-5]($|[^\\d])");
if (p.matcher(inputString).find()) {
//The inputString contains the number you seek
}
Essentially, what this is doing is looking for
