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a2 = ["lively", "alive", "harp", "sharp", "armstrong"];

a1 = ["arp", "live", "strong"];

in_array(a1, a2) # ["arp", "live", "strong"]

a1 = ["xyz", "live", "strong"];

in_array(a1, a2) # ["live", "strong"]

a1 = ["live", "strong", "arp"];

in_array(a1, a2) # ["arp", "live", "strong"]

a1 = [];

in_array(a1, a2) # []

$a2 = ["lively", "alive", "harp", "sharp", "armstrong"];

$a1 = ["arp", "live", "strong"];

inArray($a1, $a2); // ["arp", "live", "strong"]

$a1 = ["xyz", "live", "strong"];

inArray($a1, $a2); // ["live", "strong"]

$a1 = ["live", "strong", "arp"];

inArray($a1, $a2); // ["arp", "live", "strong"]

$a1 = [];

inArray($a1, $a2); // []

firstStringBetween('This is a [custom] string', '[', ']'); // "custom"

firstStringBetween('This is a #custom# string', '#', '#'); // "custom"

firstStringBetween('This is a "custom" string', '"', '"'); // "custom"

firstStringBetween('This is a custom string', 'is a', 'string'); // "custom"

firstStringBetween('This is a custom string', 'This', 'a'); # "is"

firstStringBetween('This is a [custom string', '[', ']'); // ""

firstStringBetween('This is a [custom] string', '', ''); // ""

firstStringBetween('This is a custom string', '*', '*'); // ""

firstStringBetween('This is a [custom] string', '[', ']') # "custom"

firstStringBetween('This is a #custom# string', '#', '#') # "custom"

firstStringBetween('This is a "custom" string', '"', '"') # "custom"

firstStringBetween('This is a custom string', 'is a', 'string') # "custom"

firstStringBetween('This is a custom string', 'This', 'a') # "is"

firstStringBetween('This is a [custom string', '[', ']') # ""

firstStringBetween('This is a [custom] string', '', '') # ""

firstStringBetween('This is a custom string', '*', '*') # ""

differencia([1, 2, 3], [1, 2, 4]) # [3, 4]

differencia([], [1, 2, 4]) # [1, 2, 4]

differencia([1, 2, 4], []) # [1, 2, 4]

differencia(["a", "b", "c"], ["b", "a", "d"]) # ['c', 'd']