Merge pull request #1716 from sujit510/feature/isAlphabetOnly

Added snippet for isAlphabetOnly

snippets/isAlpha.md

@@ -0,0 +1,18 @@
+---
+title: isAlpha
+tags: string,regexp,beginner
+---
+
+Checks if a string contains only alpha characters.
+
+- Use `RegExp.prototype.test()` to check if the given string matches against the alphabetic regexp pattern.
+
+```js
+const isAlpha = str => /^[a-zA-Z]*$/.test(str);
+```
+
+```js
+isAlpha('sampleInput'); // true
+isAlpha('this Will fail'); // false
+isAlpha('123'); // false
+```