Regex for numbers only

Question

I haven\'t used regular expressions at all, so I\'m having difficulty troubleshooting. I want the regex to match only when the contained string is all numbers; but with the

Answer 1

If you need to check if all the digits are number (0-9) or not,

^[0-9]+$

1425 TRUE

0142 TRUE

0 TRUE

1 TRUE

154a25 FALSE

1234=3254 FALSE