McAfee MEJCAE-AM-DA Product Guide - Page 161

B Attaching Regular Expressions to Signatures

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B Attaching Regular Expressions to Signatures This appendix describes the purpose of attaching a regular expression to a signature, lists the special characters used in a regular expression, and defines the regular expression syntax used in E-Business Server. Attaching a regular expression to a signature The purpose of a regular expression on a signature is to restrict the scope of the target key's signature power. For example, a corporate administrator might place a signature with an attached regular expression on a sub-administrator, who controls the HR department, that states that he/she can only sign keys from "hr.mcafee.com". The following special characters can be used in a regular expression: • a pipe (|) • parenthesis ( ) • an asterisk (*) • a plus sign (+) • a question mark (?) • brackets [ ] • a period (.) • a caret (^) • a dollar sign ($) When using any of these characters in a regular expression, put a backslash (\) in front of a literal character to distinguish it from one of the special characters. For example, the following regular expression matches any email address from test.com, such as . Definitions of the regular expression syntax used in E-Business Server • A regular expression is zero or more branches separated by a pipe (|). The regular expression matches anything that matches one of the branches. • A branch is zero or more pieces, concatenated. The branch looks for a match for the first piece, then looks for a match for the second piece, etc. • A piece is an atom possibly followed by one of these characters: an asterisk (*), a plus sign (+), or a question mark (?). • 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 match of the atom or the null string. E-Business Server™ 8.6 Product Guide 159

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E-Business Server
™
8.6
Product Guide
159
B
Attaching Regular Expressions to Signatures
This appendix describes the purpose of attaching a regular expression to a signature, lists the special
characters used in a regular expression, and defines the regular expression syntax used in E-Business
Server.
Attaching a regular expression to a signature
The purpose of a regular expression on a signature is to restrict the scope of the target key’s signature
power. For example, a corporate administrator might place a signature with an attached regular expression
on a sub-administrator, who controls the HR department, that states that he/she can only sign keys from
“hr.mcafee.com”.
The following special characters can be used in a regular expression:
•
a pipe (
|
)
• parenthesis
( )
•
an asterisk (
*
)
•
a plus sign (
+
)
•
a question mark (
?
)
• brackets
[ ]
•
a period (
.
)
•
a caret (
^
)
•
a dollar sign (
$
)
When using any of these characters in a regular expression, put a backslash
(
\
) in front of a literal character to distinguish it from one of the special characters.
For example, the following regular expression matches any email address from test.com, such as
<.*@test\.com>
Definitions of the regular expression syntax used in E-Business Server
• A
regular expression
is zero or more branches separated by a pipe (
|
). The regular expression matches
anything that matches one of the branches.
• A
branch
is zero or more pieces, concatenated. The branch looks for a match for the first piece, then looks
for a match for the second piece, etc.
• A
piece
is an atom possibly followed by one of these characters: an asterisk (
*
), a plus sign (
+
), or a
question mark (
?
).
•
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 match of the atom or the null string.