结合两个正则表达式

Question

I have these two regular expression ,tried combining .But not working

Dim regExCheckLength As Regex = New Regex("^\w{10}$")
Dim regexCheckFormat As Regex = New Regex("\b(SSN|TC|EMP)")

I am new to reg ex,is there a way to combine

Answer 1

Use logical OR operator to combine both regexes.

Dim regExCheckLength As Regex = New Regex("^\w{10}$|\b(SSN|TC|EMP)")

To satisfy both, you need to use a positive lookahead like below,

Dim regExCheckLength As Regex = New Regex("^(?=\w{10}$).*\b(SSN|TC|EMP).*")