Regex Examples dot .
Any line that has any of the xax, xbx, ..., that is any character between two x-es.
Regex: /x.x/
Input: "abcde"
Input: "abxcxbde"
Input: "xabcde"
Input: "xabxcxde"
Input: "adax xabcde"
Input: "adax.xabcde"
Input: "x.x"
Input: "xx"
Only lines that have x.x (A real . between two x-es.)
Regex: /x\.x/
The special characters are: . * + ? ^ $ \ ( ) [ ] | { } and the delimiter: /
Some of the characters change their special meaning based on position.