Otsimine
[0-9]
[0-9]{2}
 [0-9]{2} 
[0-9]{3}[A-Z]{3}
[a-z0-9]{4}
[a-z]{1,}\.
[a-z0-9\.]{1,}@[a-z0-9]{1,}\.[a-z]{2,3}
[0-9]{2}\.[0-9]{2}\.[0-9]{4}
[a-z0-9\.]\.ee
[a-z0-9\.]{1,}\.ee
Asendamine
 ([0-9]{1,})   //sisend
 arv \1        //väljund 
([0-9]{4})-([0-9]{2})-([0-9]{2})
\3.\2.\1

[^0-9]([0-9]{4}|[0-9]{2})-([0-9]{2})-([0-9]{2})
([0-9]{3})([A-Z]{3})
numbritega \1, tähtedega \2

^.{1,}<DIR>(.{1,})$
Kataloog \1