![]() is a PCRE regular expression, which can include capturing groups.The syntax for using sed to replace (s) text in your data is: s/// When using the rex command in sed mode, you have two options: replace (s) or character substitution (y). For a longer file path, such as c:\\temp\example, you would specify c:\\\\temp\\example in your regular expression. You must escape both backslash characters in a file path by specifying 4 consecutive backslashes for the root portion of the file path. When a search includes a regular expression that contains a double backslash, for example to represent a file path like c:\\temp, the search interprets the first backslash as an escape character. SPL2 uses the asterisk as a wildcard character. The asterisk ( * ) character is a reserved character in SPL2 and can't be escaped. If you want to match a period character, you must escape the period character by specifying \. ) character is used in a regular expression to match any character, except a line break character. ![]() You don't need to escape the backslash character in the character class. The following table describes the methods and shows an example:Įnclose the string expression in quotation marks and escape the backslash character in the character class.Įnclose the string expression in forward ( / ) slashes. Regular expressions that include a character class, such as \d or \w,Ĭan be specified using one of two methods. ![]() The backslash ( \ ) character is used to ignore, or escape, most special characters in regular expressions. This is interpreted by SPL2 as a search for the text "expression" OR "with pipe". For example, A or B is expressed as A | B.īecause pipe characters are used to separate commands in SPL2, you must enclose a regular expression that uses the pipe character in double quotation marks. See rex command syntax details.Ī pipe character ( | ) is used in regular expressions to specify an OR condition. The Edge Processor solution, which uses the rex command, supports Regular Expression 2 (RE2) syntax instead of PCRE syntax. For a longer filepath, such as c:\\temp\example, you would specify c:\\\\temp\\example in your regular expression in the search string.SPL2 supports perl-compatible regular expressions (PCRE) for regular expressions. You must escape both backslash characters in a filepath by specifying 4 consecutive backslashes for the root portion of the filepath. The filepath is interpreted as c:\temp, one of the backslashes is removed. Searches that include a regular expression that contains a double backslash, such as in a filepath like c:\\temp, the search interprets the first backslash as a regular expression escape character. The backslash cannot be used to escape the asterisk in search strings. Splunk SPL uses the asterisk ( * ) as a wildcard character. ![]() The period character is used in a regular expression to match any character, except a line break character. The backslash character ( \ ) is used in regular expressions to "escape" special characters. This is interpreted by SPL as a search for the text "expression" OR "with pipe". For example, A or B is expressed as A | B.īecause pipe characters are used to separate commands in SPL, you must enclose a regular expression that uses the pipe character in quotation marks. Here are a few things that you should know about using regular expressions in SPL searches.Ī pipe character ( | ) is used in regular expressions to specify an OR condition. See the Quick Reference for SPL2 eval functions in the SPL2 Search Reference. You can use regular expressions with the rex command, and with the match, mvfind, and replace evaluation functions. Splunk Search Processing Language (SPL) regular expressions are Perl Compatible Regular Expressions (PCRE).
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