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String insert NULL - KNIME Forum (76691)

Remove 6 blanks and replace them with NULL
Table Creator
regexReplace($column1$, "^ {6}$" ,toNull(""))
String Manipulation
if ( equals(column("column1"), " ")){toNull("")}else {column("column1")}
Column Expressions (legacy)
if(regex_match($["column1"], "^ {6}"), empty_to_missing(""), $["column1"])
Expression

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