Splunk® Enterprise

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Wildcards

Use the asterisk wildcard ( * ) character to match an unrestricted number of characters in a string. If you specify an asterisk with no other criteria, you are asking to match everything. All events are retrieved up to the maximum limit. Searching for * as part of a string, generates matches based on that string. For example:

  • my* matches myhost1, myhost.ny.mydomain.com, myeventtype, and so on.
  • *host matches myhost, yourhost, and so on.
  • *host* matches host1, myhost3, yourhost27.yourdomain.com, and so on.


The more specific your search terms are to the events that you want to retrieve, the better chance you have of matching the terms. For example, searching for access denied is always better than searching for denied. If 90% of your events have the word error but only 5% have the word sshd, and the events that you want to find require both of these words, include sshd in the search to make it more efficient.

When to avoid wildcard characters

There are several situations in which you should avoid using wildcard characters.

Avoid using wildcards in the middle of a string

Wildcard characters in the middle of a word or string might cause inconsistent results. This is especially true if the string contains punctuation, such as an underscore _ or dash - character.

For example, suppose you have the following list of product IDs.

DB-SG-G01
DC-SG-G02
MB-AG-G07
MB-AG-T01
SC-MG-G01
SF-BVS-G01
SG-SH-G05
WC-SH-A02
WC-SH-G04

You create a search that looks for all of the product IDs that begin with the letter S and end in G01.

...productID=S*G01 ...

Because the product IDs contain punctuation, the search results might be inconsistent because of the way in which data that contains punctuation is indexed.

If the number of product IDs is small, specify the exact product IDs in your search. For example:

...productID=SC-MG-G01 OR productID=SF-BVS-G01 ...

If the number of product IDs is large, use a lookup. See About lookups and work flow actions.

Avoid using wildcards to match punctuation

Punctuation are characters that are not numbers or letters. If you want to match part of a string that includes punctuation, specify each string with the punctuation that you are searching for.

For example, you have the following values in the uri_path field in your events.

/cart.do	
/cart/error.do	
/cart/success.do
/category.screen		
/oldlink
/product.screen	
/productscreen.html
/show.do	
/stuff/logo.ico	


You want to match every uri_path that starts with /cart. The problem is that the paths contain a forward slash ( / ) character and period ( . ) character. Instead of specifying a wildcard character for the punctuation such as /cart*, specify the punctuation directly in your search criteria. For example, specify /cart.do OR /cart/error.do OR /cart/success.do.

Prefix wildcards might cause performance issues

When you use a wildcard character at the beginning of a string, performance degradation might occur.

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This documentation applies to the following versions of Splunk® Enterprise: 6.2.0, 6.2.1, 6.2.2, 6.2.3, 6.2.4, 6.2.5, 6.2.6, 6.2.7, 6.2.8, 6.2.9, 6.2.10, 6.2.11, 6.2.12, 6.2.13, 6.3.0, 6.3.1, 6.3.2, 6.3.3, 6.3.4, 6.3.5, 6.3.6, 6.3.7, 6.3.8, 6.3.9, 6.3.10, 6.3.11, 6.3.12, 6.4.0, 6.4.1, 6.4.2, 6.4.3, 6.4.4, 6.4.5, 6.4.6, 6.4.7, 6.4.8, 6.4.9, 6.5.0, 6.5.1, 6.5.1612 (Splunk Cloud only), 6.5.2, 6.5.3, 6.5.4, 6.5.5, 6.5.6, 6.6.0, 6.6.1, 6.6.2, 6.6.3, 6.6.4, 7.0.0, 7.0.1


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