cregex | small implementation of regular expression matching engine | Regex library

by jserv C Version: Current License: BSD-2-Clause

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kandi X-RAY | cregex Summary

cregex is a C library typically used in Utilities, Regex applications. cregex has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

cregex is a compact implementation of regular expression (regex) matching engine in C. Its design was inspired by Rob Pike's regex-code for the book "Beautiful Code" available online here. It is based on two papers by Russ Cox:. cregex supports a subset of the syntax and semantics of the POSIX Basic Regular Expressions. The main design goal of cregex is to be small, correct, self contained and use few resources while retaining acceptable performance and feature completeness.

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Quality

Security

License

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Support

cregex has a low active ecosystem.

It has 63 star(s) with 5 fork(s). There are 4 watchers for this library.

It had no major release in the last 6 months.

cregex has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of cregex is current.

Quality

cregex has no bugs reported.

Security

cregex has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

cregex is licensed under the BSD-2-Clause License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

cregex releases are not available. You will need to build from source code and install.

Installation instructions, examples and code snippets are available.

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cregex Key Features

No Key Features are available at this moment for cregex.

cregex Examples and Code Snippets

No Code Snippets are available at this moment for cregex.

Community Discussions

Trending Discussions on cregex

Slow performance using boost xpressive

Passenger: failed to compile Apache 2 module

Converting from sub_match' to 'const char *const &'

Why am I getting: Object file was built for newer iOS version than being linked?

QUESTION

Slow performance using boost xpressive

Asked 2018-Mar-16 at 02:41

Lately I have being using boost xpressive for parsing files. These files are 10 MB each and there will be several hundred of them to parse.

Xpressive is nice to work and clear syntax, but the problems comes with performance. It is incredible how it crawls in debug versions, while in release version it spends more than a whole second per file. I have tested against old plain get_line(), find() and sscanf() code, and it can beat xpressive easily.

I understand that type checking, backtracking and so have a cost, but this seems excessive to me. How I wonder, I am doing something wrong? Is it any way of optimizing this to run at a decent pace? Should it deserve the effort to migrate code to boost::spirit?

I have prepared a lite version of code with a few lines of a real file embedded in case someone might test and help.

NOTE- As a requirement, VS 2010 must be used (not fully c++11 compliant unfortunately)

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ANSWER

Answered 2018-Mar-14 at 23:11

I see roughly two areas for improvement:

you basically parse all lines, including the ones that don't interest you
you allocate a lot of strings

I'd suggest using string views to fix the allocations. Next, you could try to avoid parsing lines that don't match the SEQUENCE pattern. There's no reason in principle why this couldn't be done using Boost Xpressive, but my weapon of choice happens to be Boost Spirit, so I'll include it too.

Being Selective

You can detect interesting lines before spending more effort like this:

Source https://stackoverflow.com/questions/49262634

QUESTION

Passenger: failed to compile Apache 2 module

Asked 2017-Aug-22 at 18:31

I tried installing passenger on AWS for rails and got through the tutorial I was following. At the end I was having an issue so I uninstalled passenger. However, now I am unable to re-install. It gets stuck compiling Apache 2. I'd appreciate any ideas. I also tried doing rm -rf* on the folders it mentioned it couldn't remove and it didn't seem to work. Thanks for any help!

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ANSWER

Answered 2017-Aug-22 at 18:31

I think this has to do with your user permissions, try this :

Source https://stackoverflow.com/questions/45823057

QUESTION

Converting from sub_match' to 'const char *const &'

Asked 2017-Mar-25 at 23:22

I am trying to map std::match_results data to my std::multimap variable. Here's the code:

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ANSWER

Answered 2017-Mar-25 at 15:33

You haven't completed dereferencing the matches. (*i)[1] returns a const sub_match & object (where the type of your begin/end iterators goes in place the BidirectionalIterator). This sub_match object includes a pair of iterators referencing the first and one-past-the-last characters in your source string for that match.

To get the character at that value, you need to do something like *(*i)[1].first.

For what you're showing, you don't need that first loop to count the number of matches. If your actual code is more complicated, and you do need to run the loops twice, make a copy of the iterator before running it thru the first loop.

Source https://stackoverflow.com/questions/43017859

QUESTION

Why am I getting: Object file was built for newer iOS version than being linked?

Asked 2017-Feb-06 at 15:43

I'm getting "was built for newer version" warning when I build my project (see stack trace at bottom).

I'm sure it is the right version as I'm building it myself and I've checked with otool (https://stackoverflow.com/a/32382761/969325).

The setup is a C++ library build with xcode command tool (libA.a) this library is then included into an xcode project which build a static library (libWordprediction). From there it is included into my main iOS project.

Every time we build a binary file we will lipo them together to a fat binary in order to build for both simulator and device.

Now the setup works without any issues beside the warnings but I'd really like to be free of the warnings (and not just with -w option!)

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ANSWER

Answered 2017-Feb-06 at 14:55

You are building the libWordprediction library for target OS 10.2, but the app consuming the library targets OS 9.

To fix this build libWordprediction for target OS 9 too.

Source https://stackoverflow.com/questions/42070158

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install cregex

Simply run to build the library and test programs. Run the tests from Go distribution. Visualize the regular expressions with Graphviz.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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