Update js codes.docx

Author: priya42bagde

js codes.docx

@@ -2981,3 +2981,35 @@ function flatDeep(arr, d = 1) {
 };
 console.log(flatDeep(arr, Infinity)) //[1,2,12,23,75,34,2,34,32,45,3,456,56,5]
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+Regular Expression(Regex):
+A regular expression is a group of characters or symbols which is used to find a specific pattern in a text.
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+Regular expressions are normally case-sensitive so the regular expression The would not match the string the
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