Regular expression for validating hexadecimal color codes (#1504)

* Create validateHexColor.js

* Create readme.md

* Update validateHexColor.js

Author: manrick

Regular Expressions/Hexadecimal color/readme.md

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+## This code snippet helps validating the hexadecimal color codes ##
+
+Based on the regular expression, the following formats are allowed:
+* #ABC
+* #AB1
+* #123
+* #ABCDEF
+* #ABC123
+* #123456 

Regular Expressions/Hexadecimal color/validateHexColor.js

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+/** 
+* Hexadecimal color pattern. The following formats are allowed:
+* #ABC | #AB1 | #123
+* #ABCDEF | #ABC123 | #123456 
+*/
+const hexColorRegex = /^#([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$/g;
+
+const colorCode = "#ABC123";
+
+if (hexColorRegex.test(colorCode)) {
+  gs.info("Valid hexadecimal color");
+} 
+else {
+  gs.info("Invalid hexadecimal color");
+}