![]() ![]() Parentheses define match or capture groups, atomic groups, and lookarounds. Matches a Social Security Number with or without dashes. You can apply quantifiers ( *, +, ? ) to the enclosed group and use alternation within the group. Regular expressions allow groupings indicated by the type of bracket used to enclose the regular expression characters. Matches a date string such as 12/31/14 or 01.01.15, but can also match 99A99B99. ![]() Matches a sequence of a digit, a non-whitespace character, and another digit. Matches a sequence of a digit, a whitespace, and then another digit. ![]() Matches a Social Security number, or a similar 3-2-4 number string. Match a word character (a letter, number, or underscore character). ![]() For example, use a lookaround to match x that is followed by y without matching y.Ĭharacter types are short for literal matches. This definition matches the regular expression in the group but gives up the match to keep the result. To indicate a back reference to the value, specify a dollar symbol ( $) and a number (not zero).Ī way to define a group to determine the position in a string. Literal groups that you can recall for later use. For example, * matches 0 or more, + matches 1 or more, and ? matches 0 or 1. Use ( *, +, ? ) to define how to match the groups to the literal pattern. For example, grey|gray matches either grey or gray. Use a vertical bar or pipe character ( | ) to separate the alternate patterns, which can include full regular expressions. Refers to supplying alternate match patterns in the regular expression. matches any character, \w matches words or alphanumeric characters including an underscore, and so on.Ĭharacter types that match text formatting positions, such as return ( \r) and newline ( \n). Similar to a wildcard, character types represent specific literal matches. Begin the character class with a caret (^) to define a negative match, such as to match any lowercase letter. To set up a character class, define a range with a hyphen, such as, to match any uppercase letter. You can apply quantifiers to and use alternation within enclosed groups.Ĭharacters enclosed in square brackets. Groups can define character classes, repetition matches, named capture groups, modular regular expressions, and more. The metacharacters that define the pattern that Splunk software uses to match against the literal. The exact text of characters to match using a regular expression. Regular expressions terminology and syntax Term However, the Splunk platform does not currently allow access to functions specific to PCRE2, such as key substitution. The Splunk platform includes the license for PCRE2, an improved version of PCRE. Splunk regular expressions are PCRE (Perl Compatible Regular Expressions) and use the PCRE C library. See Quick Reference for SPL2 eval functions in the SPL2 Search Reference. Search commands that use regular expressions include rex and evaluation functions such as match and replace. You also use regular expressions when you define custom field extractions, filter events, route data, and correlate searches. Regular expressions match patterns of characters in text and are used for extracting default fields, recognizing binary file types, and automatic assignation of source types. For a discussion of regular expression syntax and usage, see an online resource such as or a manual on the subject. #escaped table tbody td div.This primer helps you create valid regular expressions. (I tried using the replace in the token evaluation directly but it only seems to work on a field not a string.) The token value is the contents of the second multi-value in the field, which has been hidden using CSS. In the following example, the token used in the title is set when the field is clicked. You could try replacing every special character with a backslash followed by that character. ![]()
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