How to use JavaScript Regex both literal notation and regexp object constructor method with examples

The regular expression patterns can be used within a number of JavaScript methods, to check for matches and do something within the code. In JavaScript you can create the regular expression in two ways, either with a regular expression literal, where the pattern is nested between two forward slashes or using the constructor object which requires a pattern as a string argument. If you expect the pattern to change or are receiving the pattern from an external source use the constructor.

Regular expression literal
const myPattern1 = /a/;

RegExp constructor object
const myPattern2 = new RegExp('a');

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