# isAlNum {#isalnum}

**Parent topic:**[Functions](../../Functions/category.md)

## Syntax {#syntax}

`isAlNum(X)`

## Arguments {#arguments}

**X** is a CHAR/STRING/SYMBOL scalar, vector, or table.

## Details {#details}

Return "true" if all characters in string X are alphanumeric \(either alphabets or numbers\).

If *X* is a table, the function is applied only to columns of character types \(CHAR, STRING, or SYMBOL\). Other column types are ignored.

## Examples {#examples}

```
isAlNum("123456");
// output: true

isAlNum("1And1");
// output: true

isAlNum("10.05");
// output: false

isAlNum(string());
// output: false
```

