![]() the dot matches any character except the newline symbol.Įxample: ".a" matches two consecutive characters where the last one is "a".Įxample: ".*\.txt$" matches all strings that end in ".txt". There also exist some special constructs with parentheses. The groups can be referenced in both the search and the substitution phase. ( ) the opening and closing parenthes3s are used for grouping characters (or other regexes). Here the search string is one character class and all the meta characters are interpreted as ordinary characters without the need to escape them. The "^" as the first character following the "" character class construction, most special characters are interpreted as ordinary characters.Įxample: "" is the same as "" and matches "d", "e" or "f".Įxample: "" matches any lower-case characters in the alphabet.Įxample: "" matches any character that is not an ASCII digit.Įxample: A search for "" in the string "()?$^.*?^" followed by a replace string "r" has the result "rrrrrrrrrrrrr". the opening and closing square brackets define a character class to match a single character. the opening and closing curly brackets are used as range quantifiers. $ the dollar sign is the anchor for the end of the string.Įxample: "b$" matches a "b" at the end of a line. ![]() ^ the caret is the anchor for the start of the string, or the negation symbol.Įxample: "^a" matches "a" at the start of the string. The combination "\w" stands for a "word" character, one of the convenience escape sequences while "\1" is one of the substitution special characters.Įxample: The regex "aa\n" tries to match two consecutive "a"s at the end of a line, inclusive the newline character itself.Įxample: "a\ " matches "a " and not a series of one or "a"s. For example, the combination "\n" stands for the newline, one of the control characters. The backslash gives special meaning to the character following it. The following characters are the meta characters that give special meaning to the regular expression search syntax: \ the backslash escape character. See About Splunk regular expressions in the Knowledge Manager Manual.Regular expressions 1.See Extract fields using regular expressions.For a longer filepath, such as c:\\temp\example, you would specify c:\\\\temp\\example in your regular expression in the search string. 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. If you want to match a period character, you must escape the period character by specifying \. 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 Splunk searches.Ī pipe character ( | ) is used in regular expressions to specify an OR condition. You can also use regular expressions with evaluation functions such as match and replace. You can use regular expressions with the rex and regex commands. Splunk Search Processing Language (SPL) regular expressions are PCRE (Perl Compatible Regular Expressions).
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