fieldr

fieldr, function

def const pure fieldr(haystack: text, separator: text, n: number): text

Returns the n^th field, zero-indexed from the right, in a text value haystack that contains multiple sub-text values separated by a specified separator.

This function is intended to facilitate parsing values that have been concatenated within a single table column.

Example

haystack = "a-b-c-d"

show summary "Example 1" with
  fieldr(haystack, "-", 0) // "d"
  fieldr(haystack, "-", 1) // "c"
  fieldr(haystack, "-", 2) // "b"

Remarks

Repeated separator

If the separator is repeated twice in a row in the haystack, an empty field is considered to separate them:

haystack2 = "a--c-d"

show summary "Example 2" with
  fieldr(haystack2, "-", 0) // "d"
  fieldr(haystack2, "-", 1) // "c"
  fieldr(haystack2, "-", 2) // ""

Out of range index

If the haystack does not contain enough fields, an empty text is returned:

haystack3 = "a"

show summary "Example 3" with
  fieldr(haystack3, "-", 0) // "a"
  fieldr(haystack3, "-", 1) // ""
  fieldr(haystack3, "-", 2) // ""

Edge cases

If the separator is empty, or if n is negative, the function returns an empty text :

show summary "Edge cases" with
  fieldr("ab-cd", "", 1) // ""
  fieldr("ab-cd", "-", -1) // ""

See also

• fieldCount
• field