To place comma after every 3rd character in string

[Sanket_1996]

I want to add comma after every third character in the string data type, the length of this string will vary in each row,

For exp : 000XXX000000000000000000000000
000240240240210120120030XXX060060030XXXXXXXXX000000000
STDSTDSTDSTDSTDSTDSTDSTD

Expected result : 000,XXX,000,000,000,000,000,000,000,000
000,240,240,240,210,120,120,030,XXX,060,060,030,XXX,XXX,XXX,000,000,000
STD,STD,STD,STD,STD,STD,STD,STD

[aworker]

Hi @Sanket_1996 and welcome to the KNIME community

Please find below a generic solution based on the regex operator in the -String Manipulation- node:

replace( strip( regexReplace($Text$, join(".{", string( $${IPeriod}$$),"}"), "$0 ")), " ", $${SCharacter}$$)

A simplified version just answering your question “Comma every 3 characters” would be as follows:

replace( strip( regexReplace( $Text$, ".{3}", "$0 ")), " ", $${SCharacter}$$)

The workflow can be downloaded from here:

20220823 Pikairos How to Intercalate a set of Characters after every N Characters in String.knwf (29.6 KB)

Hope it helps.

Best,
Ael