# make\_filename

### Description

The `make_filename` operator takes any text and turns it into a safe file name.  Uppercase letters are turned to lowercase and illegal characters like e.g. `/`, `$`, `|`, `-`, or `$` are removed from the given text.

### Example: Filename from Just Text

```
make_filename("Holiday Pictures 2012 & 2013")
```

This will return a string that looks like this: `holiday_pictures_2012_2013`

### Example: Filename from Information

You can also use make\_filename in combination with other operators and information from a case. 

```
p is Person
make_filename(
    JOIN(
        (
            p.date_of_birth,
            p.first_name + ' ' + p.last_name
        ),
        " - "
    )
)
```

If both pieces of information are known, you would get a string that could look like this:

`1987_02_28_thorben_croise`