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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Try to use tools like debuggex:
https://www.debuggex.com/r/xN8wfXZE1Y4Qd3MO
It shows that your regexp matches two numbers and two any symbols, like this:
"11xx"
point "." match any symbol
may i see your regexp?