regex4seq

Welcome to RegEx4Seq

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:

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 page on ReadTheDocs.