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A regular expression (shortened as regex or regexp), [1] sometimes referred to as rational expression, [2][3] is a sequence of characters that specifies a match pattern in text. Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings, or for input validation.
RE2 (software) RE2 is a software library which implements a regular expression engine via finite-state machines using automata theory, in contrast to almost all other regular expression libraries, which use backtracking implementations. It provides a C++ interface. RE2 was implemented and used by Google.
List of regular expression libraries. FPGA accelerated >100 Gbit/s regex engine for cybersecurity, financial, e-commerce industries. hardware-accelerated search acceleration using RegEx available for ASIC, FPGA and cloud. Enables massively parallel content processing at ultra-high speeds. ^ Formerly called Regex++.
Oniguruma (鬼車) is a free and open-source regular expression library that supports a variety of character encodings written by K. Kosako. The Ruby programming language, in version 1.9, as well as PHP 's multi-byte string module (since PHP5), use Oniguruma as their regular expression engine. [2] It is also used in products such as Atom, [3 ...
re2c is a free and open-source lexer generator for C, C++, Go, and Rust.It compiles declarative regular expression specifications to deterministic finite automata.Originally written by Peter Bumbulis and described in his paper, [1] re2c was put in public domain and has been since maintained by volunteers. [3]
Website. pcre.org. Perl Compatible Regular Expressions (PCRE) is a library written in C, which implements a regular expression engine, inspired by the capabilities of the Perl programming language. Philip Hazel started writing PCRE in summer 1997. [3] PCRE's syntax is much more powerful and flexible than either of the POSIX regular expression ...
RE/flex (regex-centric, fast lexical analyzer) is a free and open source computer program written in C++ that generates fast lexical analyzers (also known as "scanners" or "lexers") in C++. RE/flex offers full Unicode support, indentation anchors, word boundaries, lazy quantifiers (non-greedy, lazy repeats), and performance tuning options.
TRE is an open-source library for pattern matching in text, [ 2] which works like a regular expression engine with the ability to do approximate string matching. [ 3] It was developed by Ville Laurikari [ 1] and is distributed under a 2-clause BSD-like license . The library [ 4] is written in C and provides functions which allow using regular ...