![]() ![]() Here's an example:Įither method returns a field called ipclass that contains the class portion of the IP address. You can use a forward slash ( / ), instead of quotation marks, to enclose the expression that contains a character class. You can escape the backslash character by enclosing the string in quotation marls and adding another backslash to the character class, as shown in this example: You can specify the expression in one of two ways. However, the expression uses the character class \d. ![]() You want to extract the IP class from the IP address. In this example, the clientip field contains IP addresses. Regular expressions with character classes | rex field=ccnumber mode=sed "s/(\\d/XXXX-XXXX-XXXX-/g" 2. eval ipaddressesmvappend ('localhost', srcip) Nested mvappend functions This example shows how to use nested mvappend functions. The results are placed in a new multivalue field called ipaddresses. The \d must be escaped in the expression using a back slash ( \ ) character. Examples Specifying literals and field names This example shows how to append the literal value localhost to the values in the srcip field. With the Filter using Eval Expression rule, you can do a 10 sample of data with this eval expression: (random () 10) > 0. For more information about working with dates and time, see. Additionally, you can use the relativetime () and now () time functions as arguments. You can also use these variables to describe timestamps in event data. This would reduce ingest volume by 90, which could be quite a large cost saving. This topic lists the variables that you can use to define time formats in the evaluation functions, strftime () and strptime (). In this example the first 3 sets of numbers for a credit card are masked. In the simplest case, you might want to index 10 of your events. Use a to match the regex to a series of numbers and replace the numbers with an anonymized string to preserve privacy. To learn more about the rex command, see How the rex command works. The following are examples for using the SPL2 rex command. ![]()
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