d0ddf150d9
After implementing unit testing to nrex I caught and fixed some errors
so it should behave more like Python's RegEx In addition, I've added
version numbering so it should be able to tell if the library needs
updating. Here are a list of changes:
- Fixed zero count quantifiers failing.
- Fixed infinite recursion if quantifying zero length token.
- Fixed `$` (as a string pattern on its own) not matching.
- Fixed look behind rewinding beyond the start of the string.
- Added support for alternative back reference format `\g{1}` similar to
Python. This allows digits to be used immediately after back references.
- Number of capture groups are still limited to 9 by default but can now
be manually set, with option for no limit at all. (Python has no limit)
- Curly bracket quantifiers `{0}` no longer interpreted as a literal
string if previous token is not quantifiable. (Python behaviour)
61 lines
2.1 KiB
Markdown
61 lines
2.1 KiB
Markdown
# NREX: Node RegEx
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Version 0.1
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Small node-based regular expression library. It only does text pattern
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matchhing, not replacement. To use add the files `nrex.hpp`, `nrex.cpp`
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and `nrex_config.h` to your project and follow the example:
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nrex regex;
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regex.compile("^(fo+)bar$");
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nrex_result captures[regex.capture_size()];
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if (regex.match("foobar", captures))
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{
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std::cout << captures[0].start << std::endl;
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std::cout << captures[0].length << std::endl;
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}
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More details about its use is documented in `nrex.hpp`
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Currently supported features:
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* Capturing `()` and non-capturing `(?:)` groups
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* Any character `.` (includes newlines)
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* Shorthand caracter classes `\w\W\s\S\d\D`
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* POSIX character classes such as `[[:alnum:]]`
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* Bracket expressions such as `[A-Za-z]`
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* Simple quantifiers `?`, `*` and `+`
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* Range quantifiers `{0,1}`
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* Lazy (non-greedy) quantifiers `*?`
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* Begining `^` and end `$` anchors
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* Word boundaries `\b`
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* Alternation `|`
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* ASCII `\xFF` code points
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* Unicode `\uFFFF` code points
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* Positive `(?=)` and negative `(?!)` lookahead
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* Positive `(?<=)` and negative `(?<!)` lookbehind (fixed length and no alternations)
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* Backreferences `\1` and `\g{1}` (limited by default to 9 - can be unlimited)
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## License
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Copyright (c) 2015, Zher Huei Lee
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All rights reserved.
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would
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be appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not
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be misrepresented as being the original software.
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3. This notice may not be removed or altered from any source
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distribution.
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