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Replace first (replace)

Description

Searches for a value in a given string and returns a new string where only the first occurrence (if any) is replaced by another indicated value. Note that this operation is case sensitive.

How does it work in the search window?

Select Create field in the search window toolbar, then select the Replace first operation. You need to specify three arguments:

Argument

Data type

Argument

Data type

Starting string mandatory

string

Substring to search mandatory

string

Substring to replace mandatory

string

The data type of the values in the new field is string.

Example

In the siem.logtrust.web.activity table, we want to create a new field that replaces only the first = occurrence in all the strings of the params column by _ . To do it, we will create a new field using the Replace first operation.

The arguments needed to create the new field are:

  • String - params field

  • Substring to search - Click the pencil icon and enter =

  • Substring to replace - Click the pencil icon and enter _

Click Create field and you will see the following result:

 

How does it work in LINQ?

Use the operator select... as...  and add the operation syntax to create the new column. This is the syntax for the Replace first operation:

  • replace(string, string_to_search, string_to_replace)

Example

You can copy the following LINQ script and try the above example on the siem.logtrust.web.activity table. 

from siem.logtrust.web.activity select replace(params, "=", "_") as replacefirst_parameters