Concatenation Operator

Go forward to Repetition Operators.
Go backward to Match-any-character Operator.
Go up to Common Operators.


The Concatenation Operator
==========================

  This operator concatenates two regular expressions A and B.  No
character represents this operator; you simply put B after A.  The
result is a regular expression that will match a string if A matches
its first part and B matches the rest.  For example, `xy' (two
match-self operators) matches `xy'.