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+# String Manipulation (GorillaStack)
+
+|||
+|---|---
+| **JEP**    | 16
+| **Author** | Chris Armstrong (Gorilla Stack)
+| **Status** | draft
+| **Created**| 31-10-2019
+
+## Abstract
+
+This document proposes expanding the list of available string manipulation
+functions in the spec.
+
+## Motivation
+
+The specification only contains basic string search and manipulation functions,
+such as starts_with() and contains(), which are insufficient for other use
+cases, such as replacing parts of strings, splitting strings, using regular expressions
+for searching or manipulation of strings, or other common string manipulations
+found in the common libraries of mainstream languages such as Python or JavaScript.
+
+## Specification
+
+The following functions will be added to the specification:
+
+### split
+
+```
+array[string] split(string $subject, string $split_str, number $max = -1)
+```
+
+Given string `$subject`, split will split on occurrences string `$split_str`, up to and including
+$max times (if specified).
+
+The result is an array containing each partial string between occurrences of `$split_str`. If the
+string contains no occurrences of  $split_str, an array containing just the original `$subject`
+string will be returned.
+
+`$max` is a optional parameter. When specified as an integer greater than zero, it will split the
+string up to `($max - 1)` times, with the last string in the array containing the remaining
+contents of `$subject` unmodified.
+
+If not specified or it is less than zero, the string will be split on every occurrence of `$split_str`.
+
+When `$max` is equal to zero, it will behave as if the string is not split at all, and return
+an array containing one element, the original string.
+
+### Examples
+
+| Expression | Result 
+|---|---
+| `split('average\|-\|min\|-\|max\|-\|mean\|-\|mode\|-\|median', '\|-\|')` | `["average", "min", "max", "mean", "mode", "median"]`|
+| `split('average\|-\|min\|-\|max\|-\|mean\|-\|mode\|-\|median', '\|-\|', 3)` | `["average", "min", "max\|-\|mean\|-\|mode\|-\|median"]`
+| `split('average\|-\|min\|-\|max\|-\|mean\|-\|mode\|-\|median', '-')` | `["average\|", "\|min\|", "\|max\|", "\|mean\|", "\|mode\|", "\|median"]`
+| `split('average\|-\|min\|-\|max\|-\|mean\|-\|mode\|-\|median', '\|-\|', 0)` | `["average\|-\|min\|-\|max\|-\|mean\|-\|mode\|-\|median"]`
+| `split('every character', '')` | `["e", "v", "e", "r", "y", " ", "c", "h", "a", "r", "a", "c", "t", "e", "r"]`
+
+## Impact
+
+There should be no impact to existing users, as these are new functions.