{
  "name": "longest_common_substring",
  "type": "function",
  "description": "Returns the longest common substring between two strings. This substring is the longest string that is a substring of the two input strings. Eg, the longest common substring of \"ABABC\" and \"BABCA\" is \"ABC\". The substring is case sensitive.",
  "arguments": [
	{"arg":"string1","description":"a string"},
	{"arg":"string2","description":"a string"}
  ],
  "examples": [
	{ "expression":"longest_common_substring('ABABC','BABCA')", "returns":"'ABC'"},
	{ "expression":"longest_common_substring('abcDeF','abcdef')", "returns":"'abc'"},
	{ "expression":"longest_common_substring(upper('abcDeF'),upper('abcdex'))", "returns":"'ABCDE'"}
  ]
}