正则表达式，数字后跟字母

Question

I am trying get the Regex right for the following scenario but have some trouble. Below is the scenario.

My string looks like this: 141st ST or 141ST ST

I want to get only the 141st part

Answer 1

This should work.

[0-9]{3}[A-Za-z]{2}

3 numbers with

[0-9]{3}

1 to 3 digits with

[0-9]{1,3}

and 2 letters with

[A-Za-z]{2}

Answer 2

If you want to be cool you could do it this way to validate the street number too:

\d{0,2}(?:1st|2nd|3rd|[04-9]th)(?= st)

and just use the case insensitive flag