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Tectia

Egrep Patterns

The escape character is a backslash (\). You can use it to escape meta characters to use them in their plain character form.

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.

E|F

Disjunction, match either E or F (inclusive). E is preferred if both match.

E*

Act as Kleene star, match E zero or more times.

E+

Closure, match E one or more times.

E?

Option, match E optionally once.

.

Match any character except for newline characters (\n, \f, \r) and the NULL byte.

E{n}

Match E exactly n times.

E{n,} or E{n,0}

Match E n or more times.

E{,n} or E{0,n}

Match E at most n times.

E{n,m}

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.

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