Regex to match numbers but not characters

Hey all,
I brain must not be working right or something but I cannot for the life of me figure out how to get a regex to match numbers, but not characters.
e.g.
123456
would match, but
123abc
would not. Essentially what I want to do is take a string and only return a match when the string has numbers but no characters.

No, it doesn'tYes it does.
"123abc".matches("\\d+");
"abc123".matches("\\d+");
"123".matches("\\d+");
false,false,trueExcellent example demonstrating the output of a method.
However the suggestion above was referring to a regular expression, not a method.
And the above regular expression does match with the following methods
"123abc".replaceAll("\\d+", "xxx");
"abc123".replaceAll("\\d+", "xxx");
"123".replaceAll("\\d+", "xxx");
The correct regular expression to match only digits is....
^\d+$

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