# {{page-title}}


You can filter any file bassed on a globbing pattern as you may now from your own computer file system:

## Examples:
A specific file:
```
# this rule applies to exactly one file:
- action: validate
- file: example-patient.json
```

All xml files; make sure that all xml examples have a profile field:
```
- predicate: meta.profile.exists()
  files: example/*.xml
```

## Globbing
WIth globbing you can use a double star `**` to define any sequence of subdirectories. This example
``` 
  /**/example.xml 
```
will include 
```
  main\example.xml
  main\sub\example.xml
  main\sub\sub\example.xml
```

## Multiple file filters
The files filter also allows you to define multiple filters. 
```
- action: validate
  files: 
     - /*.json
     - /*.xml
```

## Excluding files
When you want to exclude a pattern, just use an exclamation mark. If you want to exclude `package.json` from the example
above, write it like the following. You have to add quotes, or YAML will get confused:
```
- action: validate
  files: 
     - /*.json
     - "!package.json" 
     - /*.xml
```