12 BigIron RX Series Configuration Guide53-1002253-01Searching and filtering output1The filtered results are displayed.As with the commands for filtering output from show commands, the search string is a regularexpression consisting of a single character or string of characters. You can use special charactersto construct complex regular expressions. Refer to “Using special characters in regularexpressions” on page 12 for information on special characters used with regular expressions.Using special characters in regular expressionsYou use a regular expression to specify a single character or multiple characters as a search string.In addition, you can include special characters that influence the way the software matches theoutput against the search string. These special characters are listed in the following table.TABLE 29 Special characters for regular expressionsCharacter Operation. The period matches on any single character, including a blank space.For example, the following regular expression matches “aaz”, “abz”, “acz”, and so on, but not just“az”:a.z* The asterisk matches on zero or more sequential instances of a pattern.For example, the following regular expression matches output that contains the string “abc”,followed by zero or more Xs:abcX*+ The plus sign matches on one or more sequential instances of a pattern.For example, the following regular expression matches output that contains "de", followed by asequence of “g”s, such as “deg”, “degg”, “deggg”, and so on:deg+? The question mark matches on zero occurrences or one occurrence of a pattern.For example, the following regular expression matches output that contains "dg" or "deg":de?gNOTE: Normally when you type a question mark, the CLI lists the commands or options at that CLIlevel that begin with the character or string you entered. However, if you enter Ctrl-V andthen type a question mark, the question mark is inserted into the command line, allowingyou to use it as part of a regular expression.^ A caret (when not used within brackets) matches on the beginning of an input string.For example, the following regular expression matches output that begins with “deg”:^deg--More--, next page: Space, next line: Return key, quit: Control-c-telnetfiltering...sync-standby Sync active flash (pri/sec/mon/startup config/lp images)to standby if differentterminal Change terminal settingstraceroute TraceRoute to IP nodeundelete Recover deleted filewhois WHOIS lookupwrite Write running configuration to flash or terminal
