Img tag regex validator (#2136)

* Create test.js

* Delete Specialized Areas/Fix scripts/test.js

* Create script.js

* Create README.md

* Update README.md

* Update README.md

* Update README.md

* Update script.js

Author: raghavs046

Specialized Areas/Regular Expressions/Img Tag Regex validator/README.md

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+**Regex Pattern**
+1. <img : looks for <img in text 
+2. \w : looks for any word character (equivalent to [a-zA-Z0-9_])
+3. \W : looks for any non-word character (equivalent to [^a-zA-Z0-9_])
+4. '>' : looks for character >
+
+**How to use**
+1. Run this query in background/Fix scripts.
+2. The info message will return articles having images. This is very useful information when there are broken images in articles after movement between instances or tools.
+3. This can be further enhanced to replace image src if required.

Specialized Areas/Regular Expressions/Img Tag Regex validator/script.js

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+/*
+This code will search for img tag in kb articles.
+Regex Patterns:
+<img : looks for <img in text 
+\w : looks for any word character (equivalent to [a-zA-Z0-9_])
+\W looks for any non-word character (equivalent to [^a-zA-Z0-9_])
+> : looks for character >
+*/
+var kbArt = new GlideRecord('kb_knowledge');
+kbArt.addEncodedQuery('workflow_state=published'); // encoded get publiushed acticles.
+kbArt.query();
+while (kbArt.next()) {
+    var imgRegex = /<img([\w\W]+?)>/; // Regex for checking img tag.
+    var regex = new RegExp(imgRegex); // forming regex using SN.
+    if (kbArt.getValue('text') && regex.test(kbArt.getValue('text'))) { // if article body is not empty and has image tag.
+        gs.info("Image is found in KB Article: " + kbArt.getValue('number'));
+    }
+}