H3C Technologies H3C Intelligent Management Center - Manual (Page 38)

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4. Click OK.
Deleting an application
You can delete only custom applications.
To delete a custom application from UBA:
1. Access the Application Management page.
2. In the application list, click the Delete icon for the application you want to delete.
A confirmation dialog box appears.
3. Click OK.
Regular expressions in UBA
If you selected Layer 7 from the Application Type list to add an application, you must enter a regular
expression in the Regular Expression field that UBA will use to identify Layer 7 applications.
A regular expression contains 1 to 255 characters in hexadecimal notation or in text string. The
hexadecimal notation contains \x01 through \xff. The text string can contain letters, digits, and symbols
(or known as metacharacters).
The metacharacters in regular expression
The following terms describe the metacharacters in a regular expression.
• Brackets ([])—A bracket expression matches a single character contained within the brackets. For
example, [abc] matches a, b, or c.
• Vertical bar (|)—The alternation operator matches either the expression before or the expression
after the operator. For example, ab | cd matches ab or cd.
• Parentheses (())—Defines a subexpression. For example, a(b|c)d matches abd or acd, but not ab,
cd, or abcd.
• Dot (.)—Matches any single character. For example, a.b matches avb, but not ab or avwb.
Contained within a bracket expression, this character matches a literal dot.
• Asterisk (*)—Matches the preceding element zero or more times. For example, a*bc matches bc,
abc, aabc, and so on. Contained within a bracket expression, this character matches a literal
asterisk.
• Plus sign (+)—Matches the preceding element one or more times. For example, a+bc matches abc,
aabc, aaabc, and so on. Contained within a bracket expression, this character matches a literal
plus sign.
• Question mark (?)—Matches the preceding element zero or one time. For example, a?bc only
matches bc or abc. Contained within a bracket expression, this character matches a literal
question mark.
• Caret (^)—Matches the beginning of a string. For example, ^the matches the string “the man is tall”,
but not “is the man tall." A bracket expression containing this character ([^]) matches a single
character that is not contained within the brackets. For example, [^abc] matches abcd or ef, but
not ac or bc.
• Dollar sign ($)—Matches the end of a string. For example, man$ matches the string “abnormal
man”, but not “the man is tall."