Text Processing

Go 13 Sep 2026 4 min read

Transform Unicode Text with strings.Map in Go

strings.Map applies one function to every rune in a UTF-8 string and builds a string from the returned runes. A mapping function can preserve a rune, replace it, or remove it entirely. That makes the API a compact fit for transformations whose rule is naturally expressed one Unicode code point at a time. mapped := strings.Map(func(r rune) rune { if r == '_' { return '-' } return r }, input) The operation is rune-oriented rather than byte-oriented. ASCII input still follows the same contract, but multibyte UTF-8 sequences arrive at the callback as decoded rune values.

Golang Strings

Go 13 Sep 2026 5 min read

Replace Non-Overlapping Substrings with strings.ReplaceAll in Go

strings.ReplaceAll replaces every non-overlapping occurrence of one literal string with another. There is no regular-expression syntax, callback, or token model involved: matching is based on the exact byte sequence supplied as old. result := strings.ReplaceAll("api/v1/users", "/v1/", "/v2/") The result is api/v2/users. This small contract makes the function suitable for fixed substitutions where every match receives the same replacement.

Golang Strings

Python 04 Sep 2026 10 min read

Decode Streaming Text Safely in Python with Incremental Codecs

Network sockets, compressed streams, subprocess pipes, and chunked file reads often deliver bytes in arbitrary pieces. If those bytes represent text, it is tempting to decode each piece immediately: for chunk in byte_chunks: text = chunk.decode("utf-8") process(text) That works only when every chunk happens to end on a character boundary.

Python Text Processing