如何为以3个数字或连字符结尾的字符串编写正则表达式模式？

Question

I have a string that can either end with a hiphen or a 3 digit number (or a completely random text.)

I will need to evaluate a condition if it ends with a hiphen or a 3 digit number.(if its not a number or a hyphen,i am good)

I tried to use

   myString.matches("^.*\\d")

I can try to tweek this,with some help

but i really dont know how i can specify 3 digits along with "-". I can probably use myString.endsWith("-") for the latter,but if i can do it with regex,it'd be great too.

Some samples:

• This is a string123 Must return 123
• This is another string randomtext or number - must return -(Notice the hyphen)
• This is another one 456 must return 456

Answer 1

Try:

^.*(\\d{3}|-)$

The $ means "finished/ends with"