![]() If you use regular expressions in conjunction with the regex command, note that != behaves differently for the regex command than for the search command. Use the rex command to either extract fields using regular expression named groups, or replace or substitute characters in a field using sed expressions. Use the regex command to remove results that match or do not match the specified regular expression. The difference between the regex and rex commands See SPL and regular expressions in the Search Manual.Īlthough != is valid within a regex command, NOT is not valid.įor general information about regular expressions, see About Splunk regular expressions in the Knowledge Manager Manual. When you use regular expressions in searches, you need to be aware of how characters such as pipe ( | ) and backslash ( \ ) are handled. The regex command is a distributable streaming command. To keep results that do not match, specify !=. You can specify that the regex command keeps results that match the expression by using =. Optional arguments Syntax: Description: Specify the field name from which to match the values against the regular expression. The regular expression must be a Perl Compatible Regular Expression supported by the PCRE library. Regex (= | != | ) Required arguments Syntax: "" Description: An unanchored regular expression. See Overview of SPL2 eval functions.Removes results that match or do not match the specified regular expression. You can use a wide range of functions with the where command. The order in which predicate expressions are evaluated with the where command is: The search command evaluates OR clauses before AND clauses. The where command evaluation order is different than the evaluation order used with the search command. When you specify multiple predicate expressions, you must separate each expression with a logical operator. This search looks for events where the field client contains the string value 192.0.2.0. In this example, The host is interpreted as a string value. The search command handles these expressions as a field=value pair. Because the field ip-address contains a character that is not a-z, A-Z, 0-9, or and underscore ( _ ), it must be enclosed in single quotation marks. This search looks for events where the field clientip is equal to the field ip-address. This search looks for events where the field IPAddress is equal to the field clientip. You cannot do that with the search command. One advantage of the where command is that you can use it to compare two different fields. See the like (, ) function in the list of Comparison and Conditional eval functions. In this example, the where command returns search results for values in the ipaddress field that start with 198. Use the underscore ( _ ) character as a wildcard to match a single character.Use the percent ( % ) symbol as a wildcard for matching multiple characters.With the where command, you must use the like function. You can use wildcards to match characters in string values. Typically you use the where command when you want to filter the result of an aggregation or a lookup. The where command is identical to the WHERE clause in the from command.
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