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DB Column Rename (Regex)

KNIME database nodes version 4.3.2.v202103021015 by KNIME AG, Zurich, Switzerland

Renames all columns based on a regular expression search & replace pattern. The search pattern is a regular expression, and can possibly contain groups for further back referencing in the replace field.

In the simplest case, you can search and replace string literals. E.g. if the input columns are called "Foo 1", "Foo 2", "Foo 3", etc and the search string is "Foo", the replacement is "Bar", the output will be "Bar 1", "Bar 2", "Bar 3".

More complicated cases contain capturing groups, i.e. expressions in parentheses that, if matched in a column name, are saved. The groups can be referenced in the replacement string using $g , whereby g is a number 0-9. These placeholder will be replaced by the original occurrence in the input column name. For instance, to rename the columns that are produced by the Data Generator node (they follow a scheme Universe_<number1>_<number2> ) to <number2> (Uni <number1>), you would use as search string: "Universe_(\d+)_(\d+)" and as replacement: "$2 (Uni $1)".

The special sequence $i represents the current column index (unless escaped by '\' (backslash)). E.g. in order to precede each column name with the column index, use as search string "^.+$", matching the entire column name, and as replacement "$i: $0".

Further documentation regarding regular expressions can be found in the Java API documentation, in particular the classes Pattern and Matcher.


Search String (regexp)
The search pattern, which may contain groups to which to refer back in the replacement string.
The replacement string. Use $1, $2, etc. to insert the groups defined in the search pattern.
Case Insensitive
Enables case-insensitive matching.
When this flag is specified then the search string is treated as a sequence of literal characters. Metacharacters or escape sequences in the input sequence will be given no special meaning.

Input Ports

DB Data to apply database column rename.

Output Ports

DB Data with renamed columns.

Best Friends (Incoming)

Best Friends (Outgoing)



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