• . = (period) matches on any single character, including white 
space.
• * = (asterisk) matches on sequences in a pattern (zero or 
more sequences).
• + = (plus sign) matches on sequences in a pattern (one or 
more sequences).
• ? = (question mark) matches sequences in a pattern (0 or 1 
sequences).
NOTE: You must enter an escape sequence (CNTL+v) 
prior to entering the ? regular expression.
• [ ] = (brackets) matches a range of single-character 
patterns.
• ^ = (caret) matches the beginning of the input string. (If you 
use the caret at the beginning of a sequence or range, it 
matches on everything BUT the characters specified.)
• $ = (dollar sign) matches the end of the output string.
• _ = (underscore) matches a comma (,), left brace ({), right 
brace (}), left parenthesis, right parenthesis, the beginning of 
the input string, the end of the input string, or a space.
• | = (pipe) matches either character.
Defaults Not configured.
Command Modes AS-PATH ACL
Usage 
Information
The regular expression must match part of the ASCII-text in the AS-PATH attribute of the BGP 
route.
Command History
Version 8.1.1.0 Introduced on the E-Series ExaScale.
pre-Version 
6.1.1.0
Introduced on the E-Series.
ip as-path access-list
Enter AS-PATH ACL mode and configure an access control list based on the BGP AS_PATH attribute.
E-Series, S4810
Syntax
ip as-path access-list as-path-name
Parameters
as-path-name
Enter the access-list name, up to 140 characters.
Defaults Not configured.
Command Modes CONFIGURATION
Command History
Version 8.3.7.0 Introduced on the S4810.
Version 8.1.1.0 Introduced on the E-Series ExaScale.
304