string length

FEEL built-in function · FEEL string functions

string length(string)

Returns the number of characters in the string.

The length counts characters (Unicode code points), so accented letters and emoji count as one each. Spaces count too. A non-string argument such as a number gives null; convert it with string() first if you want the length of its text.

Parameters

Parameter	Type	Description
string	string	the string to measure

Examples

string length("foo")

3 Try it ↑

string length("")

0 Try it ↑

Edge cases and null handling

string length("äöü")

3 Try it ↑

Each accented letter counts as one character.

string length("ab😀")

3 Try it ↑

An emoji is one code point, so it counts as one character.

string length(" ")

2 Try it ↑

Whitespace counts.

string length(123)

null Try it ↑

Numbers are not converted. B-FEEL returns 0.

string length(string(123))

3 Try it ↑

string length(null)

null Try it ↑

Part of FEEL string functions: the rules all of them share, string concatenation, regex pitfalls and every function side by side.

Related functions

substring

Defined by the OMG DMN 1.6 specification, chapter 10.3.4 (built-in functions).