23 lines
514 B
Markdown
23 lines
514 B
Markdown
---
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title: String is alpha
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tags: string,regexp
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expertise: beginner
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cover: blog_images/coffee-phone-tray-3.jpg
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firstSeen: 2020-12-31T14:01:42+02:00
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lastUpdated: 2020-12-31T14:01:42+02:00
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---
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Checks if a string contains only alpha characters.
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- Use `RegExp.prototype.test()` to check if the given string matches against the alphabetic regexp pattern.
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```js
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const isAlpha = str => /^[a-zA-Z]*$/.test(str);
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```
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```js
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isAlpha('sampleInput'); // true
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isAlpha('this Will fail'); // false
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isAlpha('123'); // false
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```
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