shotgunsoftware/tk-core — pull request #55 by manneohrstrom (2014-03-11 23:45:35+00:00)
Title: #19034 Added regex support to filter_by template key filtering 

It is now possible to create the following template keys:

```
name:
type: str
filter_by: '^[0-9][0-9]+$'
```

This extends the existing expressions `alpha` and `alphanumeric` to match arbitrary patterns.