[Unreleased]

Added

• NIL

Changed

• NIL

Deprecated

• NIL

Removed

• NIL

Fixed

• NIL

Security

• NIL

[0.7.0] - 2026-02-15

Changed

• CMake Simplification: Drastically simplified CMake configuration for header-only library

Removed

• Binary Packaging: Removed all binary package generation (TGZ/ZIP archives, DEB, RPM, WIX MSI)

[0.6.4] - 2026-02-14

Changed

• Critical: Removed strict compiler warnings from library INTERFACE target

[0.6.3] - 2026-02-14

Added

• Strict compiler warning options: /W4 /WX for MSVC and -Wall -Wextra -Werror for GCC/Clang

Changed

• Refactored PredicateOperations tests to use std::string_view instead of std::string

Fixed

• Initialized result variables in numeric parsing benchmarks to avoid potential undefined behavior warnings
• Corrected variable naming in Unicode sample language greeting loop to avoid shadowing

[0.6.2] - 2026-02-11

Changed

• Refactored isNullOrWhiteSpace() implementation to use std::all_of for improved readability
• Updated Google Benchmark dependency from 1.9.4 to 1.9.5

[0.6.1] - 2026-02-06

Changed

• JSON Escaping: Forward slash escaping now optional (BREAKING CHANGE)
  • jsonEscape() - Added optional escapeForHtml parameter (default: false)
  • Forward slashes (/) are no longer escaped by default per RFC 8259 (optional escaping)
  • Set escapeForHtml=true when embedding JSON in HTML to escape / as \/ (prevents </script> and </style> tag issues)

[0.6.0] - 2026-02-06

Added

• UTF-8 Utilities: Unicode codepoint encoding and decoding
  • decodeUtf8Codepoint() - Decode UTF-8 byte sequences to Unicode codepoints with full validation
  • encodeUtf8Codepoint() - Encode Unicode codepoints to UTF-8 byte sequences
  • utf8Length() - Count Unicode codepoints in a UTF-8 string (not bytes)
  • isValidUtf8() - Validate that a string contains valid UTF-8 encoding
  • utf8Substring() - Extract substring by codepoint positions (zero-copy, returns string_view)
  • Supports all valid Unicode ranges (U+0000 to U+10FFFF)
  • Validates against overlong encodings, invalid surrogates, and out-of-range values

Changed

• JSON Escaping: Enhanced Unicode support
  • jsonEscape() - Added optional escapeNonAscii parameter (default: false)
  • When enabled, converts UTF-8 characters to \uXXXX JSON escape sequences
  • jsonUnescape() - Now properly handles UTF-16 surrogate pairs for emoji and supplementary characters
• XML Escaping: Enhanced Unicode support
  • xmlEscape() - Added optional escapeNonAscii parameter (default: false)
  • When enabled, converts UTF-8 characters to &#xHHHH; numeric character references
  • Generates uppercase hexadecimal encoding (e.g., &#x20AC; for €)

[0.5.1] - 2026-02-02

Changed

• Replaced anonymous namespaces with detail namespace for internal helper functions

[0.5.0] - 2026-01-25

Added

• Character Classification: Additional numeric base validation and conversion utilities
  • isOctal() - Check if character is octal digit (0-7)
  • octalToInt() - Convert octal character to integer value
  • digitToInt() - Convert decimal digit character to integer value
  • hexToInt() - Convert hexadecimal character to integer value

Changed

• Internal Code Quality: Reduced code duplication through private helper functions
  • Refactored fromString() numeric parsing to use shared parseNumericImpl() template helper
  • Refactored padding functions (padLeft, padRight, center) to use shared createPaddedString() helper
  • Improved loop index management in escape/unescape functions

Fixed

• URL Decoding: Improved validation logic for percent-encoded sequences
• IPv4 Validation: Enhanced address parsing and boundary checking

[0.4.1] - 2026-01-24

• Case-Insensitive Natural Comparison:
  • inaturalCompare() - Case-insensitive natural comparison with embedded number handling (three-way comparison returning int)
  • inaturalSort() - Case-insensitive natural sort predicate (returns bool, wrapper around inaturalCompare() < 0)

Changed

• naturalSort() - Now implemented as a wrapper around naturalCompare() < 0

[0.4.0] - 2026-01-06

Added

• String Operations: Additional overloads for improved API convenience
  • startsWith() - Added overloads accepting char and const char* parameters
  • endsWith() - Added overloads accepting char and const char* parameters
  • contains() - Added overloads accepting char and const char* parameters
  • indexOf() - Added overload accepting char parameter
  • lastIndexOf() - Added overload accepting char parameter
• Case-Insensitive String Operations: New functions for case-insensitive comparisons
  • istartsWith() - Case-insensitive prefix checking with string_view, char, and const char* overloads
  • iendsWith() - Case-insensitive suffix checking with string_view, char, and const char* overloads
  • icontains() - Case-insensitive substring search with string_view, char, and const char* overloads
  • All functions perform ASCII case-insensitive comparisons for protocol detection, file extensions, HTTP headers, etc.
• Substring Extraction: Character delimiter support for zero-allocation operations
  • substringBefore() - Added overload accepting char delimiter
  • substringAfter() - Added overload accepting char delimiter
  • substringBeforeLast() - Added overload accepting char delimiter
  • substringAfterLast() - Added overload accepting char delimiter

[0.3.0] - 2025-11-30

Added

• Character Classification: Additional character validation utilities
  • isHexDigit() - Check if character is hexadecimal digit (0-9, a-f, A-F) - constexpr and noexcept
• Internationalization Support: IDN (Internationalized Domain Names) validation
  • isIdnHostname() - Validate hostnames with Unicode characters or Punycode encoding (xn–)
  • isIdnEmail() - Validate email addresses with Unicode in local-part or domain (EAI/SMTPUTF8)
• IRI Support: Internationalized Resource Identifier validation (RFC 3987)
  • isIri() - Validate IRI format with Unicode characters (e.g., "https://example.com/路径", "http://例え.jp/テスト")
  • isIriReference() - Validate IRI or relative IRI-reference with Unicode support (e.g., "/路径/to/resource", "../über/münchen")
  • Supports Unicode in paths, queries, and fragments while maintaining strict scheme validation
  • Rejects control characters (null bytes, newlines, carriage returns) for security
• URI Template Support: URI Template validation (RFC 6570)
  • isUriTemplate() - Validate URI Template format with variable expansion syntax
  • Supports simple variables ({id}), reserved expansion ({+path}), query parameters ({?q,page})
  • Validates operators (+ # . / ; ? &), modifiers (explode *, prefix :max), and variable names
  • Comprehensive validation: rejects malformed expressions, invalid operators, and control characters

Changed

• BREAKING: Standardized acronym capitalization in function names (camelCase convention)
  • URI functions: isURIReserved() → isUriReserved(), isURIUnreserved() → isUriUnreserved(), isURI() → isUri(), isURIReference() → isUriReference()
  • IP functions: isIPv4Address() → isIpv4Address(), isIPv6Address() → isIpv6Address()
  • UUID: isUUID() → isUuid()
  • JSON Pointer: isJSONPointer() → isJsonPointer(), isRelativeJSONPointer() → isRelativeJsonPointer()
• BREAKING: Renamed validation functions for clarity and consistency
  • isValidHostname() → isHostname()
  • isValidIdnHostname() → isIdnHostname()
  • isValidPort() → isPortNumber()

Fixed

• isTime() - Corrected leap second validation (now accepts 00-60, was accepting 61+)
• isRelativeJsonPointer() - Fixed validation to accept bare non-negative integers (e.g., "0", "42")

[0.2.0] - 2025-11-29

Added

• Format Validation: Constexpr RFC-compliant validators (~54x faster than regex)
  • isDate(), isTime(), isDateTime() - RFC 3339 date/time validation
  • isDuration() - ISO 8601 duration format (P1Y2M3DT4H5M6S, P1W)
  • isEmail() - RFC 5321 email validation
  • isUUID() - RFC 4122 UUID format (8-4-4-4-12)
  • isURI(), isURIReference() - RFC 3986 URI validation
  • isJSONPointer(), isRelativeJSONPointer() - RFC 6901 JSON Pointer

[0.1.1] - 2025-11-28

Changed

• Consolidated packaging tool detection in CMake configuration

Fixed

• Removed incorrect runtime dependencies from DEB/RPM packages

[0.1.0] - 2025-11-23 - Initial Release

Added

• String Joining & Splitting: Collection and sequence operations
  • join() - Join container elements or iterator range with delimiter
  • StringSplitter - Zero-allocation string splitting with iterator interface
  • splitView() - Factory function for convenient splitting
  • Supports any string-like type (std::string, const char*, etc.)
  • Range-based for loop support
• Character Classification: ASCII character validation utilities
  • isWhitespace() - Check if character is whitespace (space, tab, newline, etc.)
  • isDigit() - Check if character is a decimal digit (0-9)
  • isAlpha() - Check if character is alphabetic (a-z, A-Z)
  • isAlphaNumeric() - Check if character is alphanumeric
  • All functions are constexpr and noexcept for compile-time evaluation
• String Validation: String content validation and testing
  • isEmpty() - Check if string is empty
  • isNullOrWhiteSpace() - Check if string is null, empty, or contains only whitespace
  • isAllDigits() - Check if string contains only digits
  • hasExactLength() - Check if string has exact length
  • All functions use std::string_view for zero-copy operations
• Case Conversion: Character and string case manipulation
  • toLower() - Convert character or string to lowercase
  • toUpper() - Convert character or string to uppercase
  • Character functions are constexpr and noexcept
  • String functions support ASCII characters only
• String Comparison: Advanced comparison operations
  • equals() - Case-sensitive string equality comparison
  • iequals() - Case-insensitive string equality comparison
  • compareIgnoreCase() - Three-way case-insensitive comparison (-1/0/+1)
  • naturalCompare() - Natural sorting with embedded number handling (e.g., "file2.txt" < "file10.txt")
  • commonPrefix() - Find longest common prefix between two strings (returns string_view)
  • commonSuffix() - Find longest common suffix between two strings (returns string_view)
  • startsWith() - Check if string starts with prefix
  • endsWith() - Check if string ends with suffix
  • contains() - Check if string contains substring
  • count() - Count non-overlapping occurrences of substring or character
  • countOverlapping() - Count all occurrences of substring including overlapping matches
• String Trimming: Whitespace removal utilities
  • trim() - Remove leading and trailing whitespace (returns string_view, zero-copy)
  • trimStart() - Remove leading whitespace (returns string_view, zero-copy)
  • trimEnd() - Remove trailing whitespace (returns string_view, zero-copy)
  • All functions are constexpr and noexcept for zero-overhead abstraction
• Predicate-Based Operations: Generic string operations with custom predicates
  • trimIf() - Remove leading/trailing characters matching predicate
  • trimStartIf() - Remove leading characters matching predicate
  • trimEndIf() - Remove trailing characters matching predicate
  • countIf() - Count characters matching predicate
  • findIf() - Find first character matching predicate
  • findIfNot() - Find first character NOT matching predicate
  • replaceIf() - Replace characters matching predicate
  • removeIf() - Remove characters matching predicate
  • All predicate functions accept lambda or function pointer accepting char and returning bool
• String Manipulation: String transformation and modification
  • replace() - Replace first occurrence of substring
  • replaceAll() - Replace all non-overlapping occurrences of substring
  • replaceIf() - Replace characters matching predicate with replacement character
  • removeAll() - Remove all occurrences of character or substring
  • removeIf() - Remove characters matching predicate
  • removeWhitespace() - Remove all whitespace characters
  • collapseWhitespace() - Collapse consecutive whitespace to single space
  • padLeft() - Pad string to specified length (right-aligned)
  • padRight() - Pad string to specified length (left-aligned)
  • center() - Center string within specified width
  • repeat() - Repeat string specified number of times
  • reverse() - Reverse string content
• Substring Extraction: Zero-copy substring operations
  • substringBefore() - Extract portion before first occurrence of delimiter
  • substringAfter() - Extract portion after first occurrence of delimiter
  • substringBeforeLast() - Extract portion before last occurrence of delimiter
  • substringAfterLast() - Extract portion after last occurrence of delimiter
  • extractBetween() - Extract substring between start and end delimiters
  • removePrefix() - Remove prefix from string if present
  • removeSuffix() - Remove suffix from string if present
  • indexOf() - Find first occurrence of substring
  • lastIndexOf() - Find last occurrence of substring
  • All functions return string_view (non-owning views into original string data)
• Unified Parsing API: String to type conversion with validation
  • fromString<T>() - Unified parsing API supporting two interfaces:
    • Output parameter: bool fromString(string_view, T& result) - zero-overhead for performance-critical code
    • Optional return: std::optional<T> fromString(string_view) - modern C++ interface
  • Supported types: bool, int, uint32_t, int64_t, uint64_t, float, double
  • Boolean parsing supports: "true"/"false", "1"/"0", "yes"/"no", "on"/"off", "t"/"f", "y"/"n" (case-insensitive)
  • Numeric parsing uses std::from_chars for optimal performance (matches stdlib at ~15ns for int)
  • Proper overflow and underflow detection via std::errc
• Text Formatting: String formatting and layout utilities
  • truncate() - Truncate string to maximum length (with optional ellipsis)
  • wordWrap() - Word wrap text to specified width
  • indent() - Add indentation to each line
  • dedent() - Remove common leading whitespace from all lines
• URI Character Classification: RFC 3986 compliant URI utilities
  • isURIReserved() - Check if character is URI reserved (:/?#[]@!$&'()*+,;=)
  • isURIUnreserved() - Check if character is URI unreserved (alphanumeric + -._~)
  • All functions are constexpr and noexcept
• String Encoding: URL, JSON, XML, and C++ string encoding/decoding
  • urlEncode() - Encode string for URL (percent-encoding per RFC 3986)
  • urlDecode() - Decode URL-encoded string
  • jsonEscape() - Escape string for JSON (handles quotes, backslashes, control characters, Unicode)
  • jsonUnescape() - Unescape JSON string (supports Unicode escapes)
  • xmlEscape() - Escape string for XML (handles special characters)
  • xmlUnescape() - Unescape XML entities
  • cppEscape() - Escape string for C++ literals (newline, tab, backslash, quotes)
  • cppUnescape() - Unescape C++ escape sequences
• Network Validation: RFC-compliant network address validation
  • isIPv4Address() - IPv4 address validation (RFC 791)
    • Validates dotted-decimal notation (e.g., "192.168.1.1")
    • Rejects leading zeros (e.g., "192.168.01.1" is invalid)
    • Range validation for each octet (0-255)
  • isIPv6Address() - IPv6 address validation (RFC 4291/5952)
    • Supports full notation (e.g., "2001:0db8:85a3:0000:0000:8a2e:0370:7334")
    • Supports compressed notation (e.g., "2001:db8::1")
    • Supports IPv4-mapped addresses (e.g., "::ffff:192.0.2.1")
    • Validates hexadecimal format and segment count
  • isValidHostname() - Hostname validation (RFC 1123)
    • Maximum 253 characters total length
    • Labels (segments) max 63 characters each
    • Labels must start/end with alphanumeric
    • Labels can contain hyphens in the middle
  • isDomainName() - Domain name validation (RFC 1035)
    • Requires fully qualified domain name format
    • At least one dot separator required
    • Follows same rules as hostname validation
  • isValidPort() - Port number validation (RFC 6335)
    • Validates port range (0-65535)
    • Compile-time type safety with templates
    • Supports string and numeric input
• Endpoint Parsing: Network endpoint parsing utilities
  • tryParseEndpoint() - Parse host:port combinations
    • Supports IPv4:port format (e.g., "192.168.1.1:8080")
    • Supports hostname:port format (e.g., "example.com:443")
    • Supports [IPv6]:port format (e.g., "[2001:db8::1]:8080")
    • Uses output parameters: bool tryParseEndpoint(endpoint, host, port)
    • Returns true on success, false on parse error
• Documentation
  • README with feature overview
  • Detailed API documentation with Doxygen comments
  • Sample applications demonstrating library usage
    • Sample_Network - Network & URI validation examples
    • Sample_StringSplitter - Zero-copy string splitting examples
    • Sample_StringBasics - Validation, parsing, case conversion
    • Sample_StringOperations - Replacement, joining, padding
    • Sample_StringPredicates - Custom predicates and filtering
    • Sample_StringEncoding - URL/JSON/XML/C++ encoding
    • Sample_StringFormatting - Truncation, wrapping, indentation
    • Sample_StringComparison - Advanced comparison operations
  • Build and installation instructions
• Testing & Benchmarking
  • Unit test suite
  • Performance benchmarks for all operations
  • Cross-compiler performance validation