// This is generated by ESQL's AbstractFunctionTestCase. Do no edit it. See ../README.md for how to regenerate it.

*Examples*

This example returns the first three characters of every last name:
[source.merge.styled,esql]
----
include::{esql-specs}/docs.csv-spec[tag=substring]
----
[%header.monospaced.styled,format=dsv,separator=|]
|===
include::{esql-specs}/docs.csv-spec[tag=substring-result]
|===
A negative start position is interpreted as being relative to the end of the string.
This example returns the last three characters of of every last name:
[source.merge.styled,esql]
----
include::{esql-specs}/docs.csv-spec[tag=substringEnd]
----
[%header.monospaced.styled,format=dsv,separator=|]
|===
include::{esql-specs}/docs.csv-spec[tag=substringEnd-result]
|===
If length is omitted, substring returns the remainder of the string.
This example returns all characters except for the first:
[source.merge.styled,esql]
----
include::{esql-specs}/docs.csv-spec[tag=substringRemainder]
----
[%header.monospaced.styled,format=dsv,separator=|]
|===
include::{esql-specs}/docs.csv-spec[tag=substringRemainder-result]
|===