- Metacharacters - SubExpression Grouping
- ( | ) Limit Alternation
/gr(e|a)y/ grey gray /get (this|that)/ get this thing get that stuffEarlier Example
Note: using /gr[ea]y/ would be equivilant
/gr(e|a)y/ grey gray /get (this|that)/ get this thing get that stuffEarlier Example