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Bidirectionally transformed strings

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The bistring library provides non-destructive versions of common string processing operations like normalization, case folding, and find/replace. Each bistring remembers the original string, and how its substrings map to substrings of the modified version.

For example:

>>> from bistring import bistr
>>> s = bistr('๐•ฟ๐–๐–Š ๐––๐–š๐–Ž๐–ˆ๐–, ๐–‡๐–—๐–”๐–œ๐–“ ๐ŸฆŠ ๐–๐–š๐–’๐–•๐–˜ ๐–”๐–›๐–Š๐–— ๐–™๐–๐–Š ๐–‘๐–†๐–Ÿ๐–ž ๐Ÿถ')
>>> s = s.normalize('NFKD')     # Unicode normalization
>>> s = s.casefold()            # Case-insensitivity
>>> s = s.replace('๐ŸฆŠ', 'fox')  # Replace emoji with text
>>> s = s.replace('๐Ÿถ', 'dog')
>>> s = s.sub(r'[^\w\s]+', '')  # Strip everything but letters and spaces
>>> s = s[:19]                  # Extract a substring
>>> s.modified                  # The modified substring, after changes
'the quick brown fox'
>>> s.original                  # The original substring, before changes
'๐•ฟ๐–๐–Š ๐––๐–š๐–Ž๐–ˆ๐–, ๐–‡๐–—๐–”๐–œ๐–“ ๐ŸฆŠ'

This allows you to perform very aggressive text processing completely invisibly.

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