Cisco Cisco Web Security Appliance S670 사용자 가이드

.

Matches any single character, except the newline character (0x0A). For example, the 
regular expression 

r.t

 matches the strings rat, rut, r t, but not root.

Be wary of using unescaped dots in long patterns, and especially in the middle of longer 
patterns. See 

for more information.

*

Matches zero or more occurrences of the character immediately preceding. For example, 
the regular expression 

.*

 means match any string of characters, and 

[0-9]*

 matches any 

string of digits.

Be wary of using this meta-character, especially in conjunction with the dot character. Any 
pattern containing an unescaped dot that returns more than 63 characters after the dot will be 
disabled. See 

for more information.

\

The escape character; it means treat the following meta-character as an ordinary character. 
For example, 

\^

 is used to match the caret character (^) rather than the beginning of a line. 

Similarly, the expression 

\.

 is used to match an actual dot rather than any single character. 

^

Matches the beginning of a line. For example, the regular expression 

^When in matches

 

the beginning of the string “When in the course of human events” but not the string “What 
and when in the”.

$

Matches the end of a line or string. For example, 

b$\.

 matches any line or string that ends 

with “b.”

+

Matches one or more occurrences of the character or regular expression immediately 
preceding. For example, the regular expression 

9+

 matches 9, 99, and 999.

?

Matches zero or one occurrence of the preceding pattern element. For example,

 colou?r

 

matches both “colour” and “color” since the “u” is optional.

( )

Treat the expression between the left and right parens as a group, limiting the scope of 
other meta-characters. For example, 

(abc)+

 matches one or more occurrences of the string 

“abc”; such as, “abcabcabc” or “abc123” but not “abab” or “ab123”.

|

Logical OR: matches the preceding pattern or the following pattern. For example 

(him|her)

 matches the line “it belongs to him” and the line “it belongs to her” but does 

not match the line “it belongs to them.”

[ ]

Matches any one of the characters between the brackets. For example, the regular 
expression 

r[aou]t

 matches “rat”, “rot”, and “rut”, but not “ret”.

Ranges of characters are specified by a beginning character, a hyphen, and an ending 
character. For example, the pattern 

[0-9]

 means match any digit. Multiple ranges can be 

specified as well. The pattern 

[A-Za-z]

 means match any upper- or lower-case letter. To 

match any character except those in the range (that is, the complementary range), use a 
caret as the first character after the opening bracket. For example, the expression 

[^269A-Z]

 matches any characters except 2, 6, 9, and uppercase letters.