re2j | linear time regular expression matching in Java | Regex library

by google Java Version: 1.7 License: Non-SPDX

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | re2j Summary

re2j is a Java library typically used in Utilities, Regex applications. re2j has build file available and it has medium support. However re2j has 18 bugs, it has 6 vulnerabilities and it has a Non-SPDX License. You can download it from GitHub, Maven.

[coverage status] re2 is a regular expression engine that runs in time linear in the size of the input. re2/j is a port of re2 to pure java. java’s standard regular expression package, java.util.regex, and many other widely used regular expression packages such as pcre, perl and python use a backtracking implementation strategy: when a pattern presents two alternatives such as a|b, the engine will try to match subpattern a first, and if that yields no match, it will reset the input stream and try to match b instead. if such choices are deeply nested, this strategy requires an exponential number of passes over the input

Support

Quality

Security

License

Reuse

Support

re2j has a medium active ecosystem.

It has 954 star(s) with 147 fork(s). There are 51 watchers for this library.

It had no major release in the last 12 months.

There are 11 open issues and 27 have been closed. On average issues are closed in 345 days. There are 5 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of re2j is 1.7

Quality

re2j has 18 bugs (0 blocker, 0 critical, 18 major, 0 minor) and 544 code smells.

Security

re2j has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

re2j code analysis shows 6 unresolved vulnerabilities (6 blocker, 0 critical, 0 major, 0 minor).

There are 0 security hotspots that need review.

License

re2j has a Non-SPDX License.

Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

Reuse

re2j releases are available to install and integrate.

Deployable package is available in Maven.

Build file is available. You can build the component from source.

Installation instructions are not available. Examples and code snippets are available.

re2j saves you 6544 person hours of effort in developing the same functionality from scratch.

It has 13599 lines of code, 661 functions and 53 files.

It has high code complexity. Code complexity directly impacts maintainability of the code.

Top functions reviewed by kandi - BETA

kandi has reviewed re2j and discovered the below as its top functions. This is intended to give you an instant insight into re2j implemented functionality, and help decide if they suit your requirements.

Builds the int array .
Performs the factorization of the given array .
Appends the regex form to the given string builder .
Simplifies the recursively .
Move to the next thread .
Append the replacement string .
Replace all matches in the source string with the given number of characters .
Returns a map of orbits where each key is the case fold
Escape a single character .
Match a single character .

Get all kandi verified functions for this library.

re2j Key Features

No Key Features are available at this moment for re2j.

re2j Examples and Code Snippets

No Code Snippets are available at this moment for re2j.

Community Discussions

Trending Discussions on Regex

How would I match `.scss`, `.sass`, `.css` but not `.ass`? (RegExp)

REGEX for matching number with two and three numbered patterns together

Is there a better way to clean a string?

Complex string manipulation by JavaScript regexp

Difference between Pattern.asMatchPredicate and Pattern.asPredicate

Regex to replace single occurrence of character in C++ with another character

Negating bracketed character classes in Perl regular expressions and grep

Regular expression that matches all specified characters in any order at the start of the line

Using PowerShell how to replace and save a value in a json file having comments

How to get customed tags in a text, and put in another text?

QUESTION

How would I match `.scss`, `.sass`, `.css` but not `.ass`? (RegExp)

Asked 2022-Mar-02 at 15:18

I have the following regex: /\.([s]?[ac]ss)$/. The problem is, it matches .scss, .sass, .css, .ass. How would I make it not match .ass?

...

ANSWER

Answered 2022-Mar-02 at 08:35

You can use

Source https://stackoverflow.com/questions/71319480

QUESTION

REGEX for matching number with two and three numbered patterns together

Asked 2022-Jan-17 at 10:25

I have an array of 5 numbers, I'd like to match as long as there are three of the same number and two of the same different number in the array, placement does not matter. Number sequences can be any random string of 5 numbers between 1 - 5. Examples of matches would be: 33322 24422 52225 44111 54545 *basically any grouping of 2 and 3 of the same numbers needs to match.

Best I've come up with so far: ^([0-9])\1{2}|([0-9])\1{1}$

I am not so good with regex, any help would be greatly appreciated.

...

ANSWER

Answered 2022-Jan-16 at 23:38

You can use

Source https://stackoverflow.com/questions/70735094

QUESTION

Is there a better way to clean a string?

Asked 2022-Jan-06 at 09:49

Currently, this is my code.

...

ANSWER

Answered 2022-Jan-06 at 04:57

A simple solution would be to convert all characters to lowercase, replace any character that isn't a-z, 0-9, or a space with a space character, and then replace multiple space characters with a single space character.

Source https://stackoverflow.com/questions/70602532

QUESTION

Complex string manipulation by JavaScript regexp

Asked 2021-Dec-17 at 14:24

I am generating some meaningful name with the following rule in a JavaScript/Node JS program:

Input: "tenancy_account__accountPublicId__workspace__workspacePublicId__remove-user__userPublicId"

Expected output: "TenancyAccountAccountPublicIdWorkspaceWorkspacePublicIdRemove-userUserPublicId"

Rules:

replace any character with zero or more underscore to the non-underscored uppercase Example:x | __*x => X
If exists remove last _

This is what is tried so far, looking for better alternatives, if any:

...

ANSWER

Answered 2021-Dec-17 at 14:21

Split and slice

Source https://stackoverflow.com/questions/70394177

QUESTION

Difference between Pattern.asMatchPredicate and Pattern.asPredicate

Asked 2021-Nov-16 at 14:57

Java 11 added some new methods to the Pattern class (a compiled version of a regular expression), including:

I am trying to understand the difference between the two and when I would want to use one over the other?

...

ANSWER

Answered 2021-Nov-16 at 14:57

Pattern.asPredicate will return true if any part of the input string matches the Regular expression. You should use this method if you're testing some larger body of text for a certain pattern. For example, to test whether a comment from a user contains a hyperlink.
Pattern.asMatchPredicate will return true if the entire input string matches the Regular expression. You should use this method if you're testing the entire input for a certain pattern. For example, to validate the phone number of a user in their profile.

Pattern.asPredicate internally uses Matcher.find(), while Pattern.asMatchPrediate internally uses Matcher.matches(). So the difference between the two boils down to the difference between these two methods from the Matcher class.

Below are some examples to showcase the difference. You can copy & paste below code in an online Java sandbox like https://www.compilejava.net/ to play around with it yourself.

Source https://stackoverflow.com/questions/69981170

QUESTION

Regex to replace single occurrence of character in C++ with another character

Asked 2021-Nov-13 at 13:13

I am trying to replace a single occurrence of a character '1' in a String with a different character.

This same character can occur multiple times in the String which I am not interested in.

For example, in the below string I want to replace the single occurrence of 1 with 2.

...

ANSWER

Answered 2021-Nov-13 at 09:22

Use a negative lookahead in the regexp to match a 1 that isn't followed by another 1:

Source https://stackoverflow.com/questions/69952780

QUESTION

Negating bracketed character classes in Perl regular expressions and grep

Asked 2021-Nov-02 at 23:48

I'm attempting to solve a very simple problem - find strings in an array which only contain certain letters. However, I've run up against something in the behavior of regular expressions and/or grep that I don't get.

...

ANSWER

Answered 2021-Nov-02 at 13:15

Both fails are fixed with the addition of anchors ^ and $ and quantifier +

These both work:

Source https://stackoverflow.com/questions/69801030

QUESTION

Regular expression that matches all specified characters in any order at the start of the line

Asked 2021-Oct-31 at 11:30

I'm looking for a regexp that matches any line that contains 'B', 'R', 'A' and 'S' (in any order) at the start. It would match all the following lines, except the last two.

...

ANSWER

Answered 2021-Oct-30 at 21:05

There are only 24 permutations :)

Source https://stackoverflow.com/questions/69781982

QUESTION

Using PowerShell how to replace and save a value in a json file having comments

Asked 2021-Oct-22 at 22:32

I have a Json file having multiple comments and I want to replace a value in it.

I tried the below and it gives me a json file without comments. But I don't understand how to change the value and save it back with comments. Is this even possible because we are replacing all the comments with empty lines?

...

ANSWER

Answered 2021-Oct-22 at 22:32

Use

Source https://stackoverflow.com/questions/69683137

QUESTION

How to get customed tags in a text, and put in another text?

Asked 2021-Oct-04 at 15:01

The header question may not be easy to understand. Hope you can understand my detailed info below.

I have sentence data below, that has some tags, represented by [tn]tag[/tn]:

...

ANSWER

Answered 2021-Oct-04 at 08:47

Here is a solution that assumes that there are no nested tags, that all tags open and close in the part. Also, this assumes that all characters from the sentence are in parts. For this last assumption, I had to add the . after it has to be in the second expected part. I also had to remove newline characters from the sentence but I think it was because of the copy/paste. This solution will loop through all characters and store two parallel buffers : one with the tags, one without. We will use the second one to compare with the parts, and use the first one to generate the output.

Source https://stackoverflow.com/questions/69432894

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

Vulnerabilities

No vulnerabilities reported

Install re2j

You can download it from GitHub, Maven.
You can use re2j like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the re2j component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

Support

We have set up a Google Group for discussion, please join the [RE2/J discussion list](http://groups.google.com/group/re2j-discuss) if you’d like to get in touch. If you would like to contribute patches, please see the [instructions for contributors](CONTRIBUTING.md).

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