01-ReverseString | 02-BracketChecker | 03-SubstringCount | 04-UpCaseLowerCase | 05-nbsp | 06-ExtractText | 07-ParseURL | 08-BBCode | 09-ExtractEmail | 10-Palindrome | 11-StringFormat | 12-Templates
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// 03. Write a JavaScript function that finds how many times a substring is contained in a given text (perform case insensitive search).