Coyote Point Systems Equalizer Especificaciones descargar pdf (Pagina 548)

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101

How to Use Regular Expressions

Regular Expression Terms

The terms in this section describe the components of regular expressions.

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

An atom followed by an asterisk (*) matches a sequence of0 or more matches of the atom.

An atom followed by a plus sign (+) matches a sequence of1 or more matches of the atom.

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.

Learning About Atoms

An atom followed by a bound that contains one integer i and no comma matches a sequence of exactly i matches

of the atom. An atom followed by a bound that contains one integer i and a comma matches a sequence of i or

more matches of the atom. An atom followed by a bound containing two integers i and j matches a sequence of i

through j (inclusive) matches of the atom. An atom can consist of any of the following:

l A regular expression enclosed in parentheses, which matches a match for the regular expression.

l An empty set of parentheses, which matches the null string.

l A bracket expression.

l A period (.), which matches any single character.

l A carat (^), which matches the null string at the beginning of a line.

l A dollar sign ($), which matches the null string at the end of a line.

l A backslash (\) followed by one of the following characters: ^.[$()|*+?{\, which matches that character taken

as an ordinary character.

l A backslash (\) followed by any other character, which matches that character taken as an ordinary

character (as if the \ had not been present).

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