Question

I need help to write a regex expression to catch following cases:

number*number like 1242*1242 or 333*333. Both side of * are the same number but they can have different length.

Answer 1

This would fix Ofer’s answer:

\b(\d+)\*\1\b

The explanation:

\b - word boundary
( - start capturing group
\d+ - digits (one or more)
) - stop capturing group
\* - literal *
\1 - matches exactly what is captured by group 1
\b - word boundary