cpp-strutil

Header-only C++17 string utility library. Fast, tested, zero dependencies.

Usage

#include "strutil.hpp"

// Split
auto parts = strutil::split("a,b,c", ',');        // {"a", "b", "c"}

// Join
auto csv = strutil::join(parts, ", ");             // "a, b, c"

// Trim
auto clean = strutil::trim("  hello  ");           // "hello"

// Case conversion
auto upper = strutil::to_upper("hello");           // "HELLO"

// Replace
auto fixed = strutil::replace("a-b-c", "-", "_"); // "a_b_c"

// Check prefix/suffix
strutil::starts_with("hello world", "hello");      // true
strutil::ends_with("hello world", "world");        // true

// Parse numbers
auto n = strutil::to_int("42");                    // std::optional<int>{42}

API

Function	Description
split(str, delim)	Split by character or string
join(parts, delim)	Join with delimiter
trim(str)	Trim whitespace both sides
trim_left(str) / trim_right(str)	Trim one side
to_upper(str) / to_lower(str)	Case conversion
starts_with(str, prefix)	Prefix check
ends_with(str, suffix)	Suffix check
replace(str, from, to)	Replace all occurrences
pad_left(str, width) / pad_right(str, width)	Padding
contains(haystack, needle)	Substring check
count(str, sub)	Count occurrences
slice(str, start, end?)	Python-style slicing
to_int(str) / to_double(str)	Safe number parsing

Build

mkdir build && cd build
cmake ..
make
make test

Quick Reference

auto s = strutil::trim("  hi  ");     // "hi"
auto v = strutil::split("a,b", ',');  // {"a","b"}
auto u = strutil::to_upper("hi");     // "HI"
bool b = strutil::starts_with(s, "x"); // false