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+{{ transformations:SearchFilterAction.png}}
+====== FILTER BY SEARCH ======
+Category: Transform / Filters\\
+\\
+=====Description=====
+This action keeps or removes rows where values in a specified column contain a particular substring. It also supports filtering using a regular expression.\\
+\\
+=====Use cases=====
+Create subsets of a dataset based on parts of values in a specific column (literal strings or regular expressions).
+Clean a dataset by removing records that may have "junk" data in a specific column.
+\\
+=====Action settings=====
+^Setting ^Description ^
+|Column|Select the column containing the values to be used for filtering.  |
+|Search type|Select what part of the values should match the search string.  See the table below.|
+|Search string<sup>*</sup>|Enter the string or regular expression to match in the selected column's values.  If "Regular expression" is selected\\ as the //Search type//, this setting changes to "Regular expression".|
+|Regular expression|This setting appears when "Regular expression" is selected as the //Search type//.  Enter the regular expression to\\ be evaluated against all values in the selected column.  See [[https://en.wikipedia.org/wiki/Regular_expression|regular expression]] for more information.|
+|Case sensitive|When checked, case will not be considered when matching the search string.|
+|Filter mode|Select whether rows with matching values will be kept in the dataset, or removed. Options: //Keep only \\ matching values// or //Remove matching values//.|
+<sup>*</sup> Setting can be specified using a [[:parameters|parameter]].
+\\
+=====Remarks=====
+In cases where no values match the search string:
+  * If //Keep only matching values// was selected, the result will be an empty dataset.
+  * If //Remove matching rows// was selected, the result will be the full dataset (no rows removed).
+\\
+=====Examples=====
+**Objective:** Find all rivers that start with 'Y'.\\
+**Source table:** The longest rivers in the world
+^River  ^Length (km)  ^Continent  ^
+| Nile  |  6650| Africa  |
+| Amazon  |  6400| South America  |
+| Yangtze  |  6300| Asia  |
+| Mississippi  |  6275| North America  |
+| Yenisei  |  5539| Asia  |
+| Yellow River  |  5464| Asia  |
+| Ob  |  5410| Asia  |
+| Paraná  |  4880| South America  |
+\\
+**Action parameters:**
+> Column is "River"
+>  Search type is "Starts with"
+> Search string is "Y"
+\\
+**Result:**
+^  River  ^  Length (km)  ^  Continent  ^
+| Yangtze  |  6300| Asia  |
+| Yenisei  |  5539| Asia  |
+| Yellow River  |  5464| Asia  |
+\\
+=====See also=====
+  * [[transformations:selectionfilter|Filter]]
+  * [[transformations:filter|Filter by condition]]
+  * [[transformations:filterbytype|Filter by type]]