How to Use Regular Expressions
Regular Expression Terms
The terms in this section describe the components of regular expressions.
l
A regular expression (RE) is one or more non-empty branches, separated by pipe symbols
(
|)
. An expression matches anything that matches one of the branches.
l
A branch consists of one or more concatenated pieces. A branch matches a match for the
first piece, followed by a match for the second, and so on.
l
A piece is an atom optionally followed by a single *, +, or ?, or by a bound.
o
An atom followed by an asterisk (*) matches a sequence of 0 or more matches
of the atom.
o
An atom followed by a plus sign (+) matches a sequence of 1 or more matches
of the atom.
o
An atom followed by a question mark (?) matches a sequence of 0 or 1 matches
of the atom.
l
A bound consists of an open brace ({) followed by an unsigned decimal integer, between 0
and 255 inclusive. You can follow the first unsigned decimal integer with a comma, or a
comma and a second unsigned decimal integer. Close the bound with a close brace (}). If
there are two integers, the value of the first may not exceed the value of the second.
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