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| Excerpt |
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Matches some or all of a string, based on the user-defined starting and ending index values within the string. |
- Input can be a column reference or a string must be a string literal value.
- Since the
SUBSTRINGfunction matches based on fixed numeric values, changes to the length or structure of a data field can cause your recipe to fail to properly execute. - The
SUBSTRINGfunction requires numerical values for the starting and ending values. If you need to match strings using patterns, you should use theextracttransform instead. See Extract Transform.
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Column reference example:
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derive type:single value:SUBSTRING(MyName,0,5) |
Output: The first five letters of the MyName column value is written to the new column.
String literal example:
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derive type:single value:SUBSTRING('Hello, World',0,5) |
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| D code |
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derive type:single value:SUBSTRING(columnstring_stringval,start_index,end_index) |
| Argument | Required? | Data Type | Description |
|---|---|---|---|
| columnstring_stringval | Y | string | Name of the column or string String literal to be applied to the function |
| start_index | Y | integer (non-negative) | Index value for the start character from the source column or value |
| end_index | Y | integer (non-negative) | Index value for the end character from the source column or value |
| D s lang notes |
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string_
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val
String constant to be searched.
- Missing string or column values generate missing string results.
- String constants must be quoted (
'Hello, World'). - Multiple columns and wildcards are not supported.
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| Data Type | Required? | Example Value |
|---|---|---|
| String | Yes |
MyName'This is my string.' |
start_index
Index value of the character in the string to begin the substring match.
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