20 lines
476 B
Markdown
20 lines
476 B
Markdown
---
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title: isAlphaNumeric
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tags: string,regexp,beginner
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---
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Checks if a string contains only alphanumeric characters.
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Use `RegExp.prototype.test()` to check if input string matches against alphanumeric regex pattern.
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```js
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const isAlphaNumeric = str => /^[a-z0-9]+$/gi.test(str);
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```
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```js
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isAlphaNumeric('hello123'); // true
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isAlphaNumeric('123'); // true
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isAlphaNumeric('hello 123'); // false (space character is not alphanumeric)
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isAlphaNumeric('#$hello'); // false
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```
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