SubField - script and chart function

Subfield() is used to extract substring components from a parent string field, where the original record fields consist of two or more parts separated by a delimiter.

The Subfield() function can be used, for example, to extract first name and surname from a list of records consisting of full names, the component parts of a path name, or for extracting data from comma-separated tables.

If you use the Subfield() function in a LOAD statement with the optional field_no parameter left out, one full record will be generated for each substring. If several fields are loaded using Subfield() the Cartesian products of all combinations are created.

Syntax:  

SubField(text, delimiter[, field_no ])

Return data type: string

Arguments:  

Argument Description
text The original string. This can be a hard-coded text, a variable, a dollar-sign expansion, or another expression.
delimiter A character within the input text that divides the string into component parts.
field_no

The optional third argument is an integer that specifies which of the substrings of the parent string text is to be returned.

  • If field_no is a positive value, substrings are extracted from left to right.
  • If field_no is a negative value, substrings are extracted from right to left.
Tip: SubField() can be used instead of using complex combinations of functions such as Len(), Right(), Left(), Mid(), and other string functions.

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