# isLower {#islower}

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

## Syntax {#syntax}

`isLower(X)`

## Arguments {#arguments}

**X** is a STRING scalar or vector.

## Details {#details}

Check whether all the case-based characters \(letters\) of the string are lowercase.

## Examples {#examples}

```
isLower("this is string example....wow!!!");
// output: true

isLower("THIS is string example....wow!!!");
// output: false

isLower("123456abc");
// output: true

isLower("123");
// output: false

isLower(["  ",string()]);
// output: [false,false]
```

Related funcitons: [isUpper](isUpper.md), [isTitle](isTitle.md)

