1/^[a-z0-9]+$/i
23^ Start of string
4[a-z0-9] a or b or c or ... z or 0 or 1 or ... 95+ one or more times (change to * to allow empty string)
6$ end of string
7/i case-insensitive
8
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please ensure to add code which is syntactically corrent and executes properly
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