# Strlen
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`strlen` returns the number of characters in a string, including spaces.

## Syntax
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```
strlen(expression)
```

## Arguments
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 *expression*   
An expression can be the name of a field that uses the string data type like **address1**, a literal value like **'Unknown'**, or another function like `substring(field_name,0,5)`.

## Return type
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Integer

## Example
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The following example returns the length of the specified string.

```
strlen('1421 Main Street')
```

The following value is returned.

```
16
```