Creating regex to extract 4 digit number from string using java

Question

Hi I am trying to build one regex to extract 4 digit number from given string using java. I tried it in following ways:

String mydata = \"get the 0025 data f         


        

Answer 1

If you want to match any number of digits then use pattern like the following:

^\D*(\d+)\D*$

And for exactly 4 digits go for

^\D*(\d{4})\D*$