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hassuffix operator

Filters a record set for data with a case-insensitive ending string. has searches for indexed terms, where a term is three or more characters. If your term is fewer than three characters, the query scans the values in the column, which is slower than looking up the term in the term index.

The following table provides a comparison of the hassuffix operators:

Operator Description Case-Sensitive Example (yields true)
hassuffix RHS is a term suffix in LHS No "microsoftWindowsSource5" hassuffix "CE5"
!hassuffix RHS isn't a term suffix in LHS No "microsoftWindowsSource5" !hassuffix "micro"
hassuffix_cs RHS is a term suffix in LHS Yes "microsoftWindowsSource5" hassuffix_cs "ce5"
!hassuffix_cs RHS isn't a term suffix in LHS Yes "microsoftWindowsSource5" !hassuffix_cs "CE5"

  • RHS = right hand side of the expression
  • LHS = left hand side of the expression

For further information about other operators and to determine which operator is most appropriate for your query, see datatype string operators.

Case-insensitive operators are currently supported only for ASCII-text. For non-ASCII comparison, use the tolower() function.

Performance tips

Performance depends on the type of search and the structure of the data.

For faster results, use the case-sensitive version of an operator, for example, hassuffix_cs, not hassuffix.


T | where Column hassuffix (Expression)


  • T - The tabular input whose records are to be filtered.
  • Column - The column to filter.
  • Expression - Scalar or literal expression.


Rows in T for which the predicate is true.


// hassuffix case insensitive
    | project original_time, data_source_name, name
    //--- Search for the last 5 mins of data    
    | where original_time > now(-5m)
    //--- USER Criteria Here
    | where data_source_name hassuffix "CE4"
    | take 2


original_time data_source_name name
2023-04-11T12:27:01.489Z microsoftWindowsSource4 The database engine has begun replaying logfile.
2023-04-11T14:52:33.756Z microsoftWindowsSource4 The database engine started a new instance.