The escape character is a backslash (
\). You can
use it to escape meta characters to use them in their plain character
In the following examples literal 'E' and 'F' denote any expression, whether a pattern or a character.
Start a capturing subexpression.
End a capturing subexpression.
Disjunction, match either E or F (inclusive). E is preferred if both match.
Act as Kleene star, match E zero or more times.
Closure, match E one or more times.
Option, match E optionally once.
Match any character except for newline characters (\n,
\f, \r) and the
Match E exactly n times.
Match E n or more times.
Match E at most n times.
Match E no less than n times and no more than m times.
Start a character set, see Character Sets For Egrep.
Match the empty string at the end of the input or at the end of a line.
Match the empty string at the start of the input or at the beginning of a line.