# Welcome to RegEx4Seq
[](https://dl.circleci.com/status-badge/redirect/gh/sfkleach/lazychains/tree/main) [](https://lazychains.readthedocs.io/en/latest/?badge=latest)
This is a python library that implements regular-expression based pattern matches for sequences of arbitrary objects. For example you can write pattern to determine if a list is a sequence of alternating 1's and 0's like this:
```py
from regex4seq import Item, Items
# The core is a repetition of alternating 0s and 1s. But we need to
# account for the pattern starting on a 1 or finishing on a zero.
# Analogous to the regex /1?[01]*0?/.
pattern = Item(1).optional() & Items(0, 1).repeat() & Item(0).optional()
pattern.matches( [1, 0, 1, 0, 1, 0, 1])
# True
pattern.matches( [1, 0, 1, 0, 1, 0, 0])
# False
```
To learn more about the library, go to [the documentation](https://regex4seq.readthedocs.io) page on ReadTheDocs.
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