regex | regular expressions for Rust | Regex library

by rust-lang Rust Version: 1.0.0 License: Apache-2.0

X-Ray Key Features Code Snippets(2)Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | regex Summary

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

It is an anti-pattern to compile the same regular expression in a loop since compilation is typically expensive. (It takes anywhere from a few microseconds to a few milliseconds depending on the size of the regex.) Not only is compilation itself expensive, but this also prevents optimizations that reuse allocations internally to the matching engines. In Rust, it can sometimes be a pain to pass regular expressions around if they’re used from inside a helper function. Instead, we recommend using the [lazy_static] crate to ensure that regular expressions are compiled exactly once. Specifically, in this example, the regex will be compiled when it is used for the first time. On subsequent uses, it will reuse the previous compilation.

Support

Quality

Security

License

Reuse

Support

regex has a medium active ecosystem.

It has 2897 star(s) with 378 fork(s). There are 47 watchers for this library.

It had no major release in the last 12 months.

There are 35 open issues and 490 have been closed. On average issues are closed in 533 days. There are 3 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of regex is 1.0.0

Quality

regex has 0 bugs and 0 code smells.

Security

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

regex code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

regex is licensed under the Apache-2.0 License. This license is Permissive.

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

Reuse

regex releases are available to install and integrate.

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

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regex Key Features

No Key Features are available at this moment for regex.

regex Examples and Code Snippets

Run benchmarks matching regex .

python

Lines of Code : 42

License : Non-SPDX (Apache License 2.0)

Copy

def _run_benchmarks(regex):
  """Run benchmarks that match regex `regex`.

  This function goes through the global benchmark registry, and matches
  benchmark class and method names of the form
  `module.name.BenchmarkClass.benchmarkMethod` to the gi

Regex replacement .

python

Lines of Code : 34

License : Non-SPDX (Apache License 2.0)

Copy

def regex_replace(input, pattern, rewrite, replace_global=True, name=None):
  r"""Replace elements of `input` matching regex `pattern` with `rewrite`.

  >>> tf.strings.regex_replace("Text with tags.
contains html",
  ...

Community Discussions

Trending Discussions on regex

Escaping metacharacters in a Raku regex (like Perl's quotemeta() or \Q...\E)?

python-docx adding bold and non-bold strings to same cell in table

What Raku regex modifier makes a dot match a newline (like Perl's /s)?

How can the Raku behavior on capturing group in alternate be the same as Perl

Difference in Perl regex variable $+{name} and $-{name}

Combine 2 string columns in pandas with different conditions in both columns

Lookaround regex and character consumption

Parsing binary files in Raku

Regex to match nothing but zeroes after the first zero

python regex where a set of options can occur at most once in a list, in any order

QUESTION

Escaping metacharacters in a Raku regex (like Perl's quotemeta() or \Q...\E)?

Asked 2022-Mar-29 at 23:38

How can I escape metacharacters in a Raku regex the way I would with Perl's quotemeta function (\Q..\E)?

That is, the Perl code

...

ANSWER

Answered 2022-Feb-10 at 00:03

Your question's answer:

You can treat characters in a Raku regex literally by surrounding them with quotes (e.g., '.*?') or by using using regular variable interpolation (e.g., $substring inside the regex where $substring is a string contaning metacharacters).

Thus, to translate the Perl program with \Q...\E from your question into Raku, you could write:

Source https://stackoverflow.com/questions/71057626

QUESTION

python-docx adding bold and non-bold strings to same cell in table

Asked 2022-Feb-26 at 21:23

I'm using python-docx to create a document with a table I want to populate from textual data. My text looks like this:

...

ANSWER

Answered 2022-Feb-26 at 21:23

You need to add run in the cell's paragraph. This way you can control the specific text you wish to bold

Full example:

Source https://stackoverflow.com/questions/71150313

QUESTION

What Raku regex modifier makes a dot match a newline (like Perl's /s)?

Asked 2022-Feb-09 at 23:24

How do I make the dot (.) metacharacter match a newline in a Raku regex? In Perl, I would use the dot matches newline modifier (/s)?

...

ANSWER

Answered 2022-Feb-07 at 10:40

TL;DR The Raku equivalent for "Perl dot matches newline" is ., and for \Q...\E it's ....

There are ways to get better answers (more authoritative, comprehensive, etc than SO ones) to most questions like these more easily (typically just typing the search term of interest) and quickly (typically seconds, couple minutes tops). I address that in this answer.

What is Raku equivalent for "Perl dot matches newline"?

Just .

If you run the following Raku program:

Source https://stackoverflow.com/questions/70996158

QUESTION

How can the Raku behavior on capturing group in alternate be the same as Perl

Asked 2022-Jan-29 at 21:40

How can Raku behavior on capturing group in alternate be just like Perl regex' one e.g.

...

ANSWER

Answered 2022-Jan-29 at 15:38

Quoting the Synopsis 5: Regexes and Rules design speculation document:

it is still possible to mimic the monotonic Perl 5 capture indexing semantics

Inserting a $3= for the (e):

Source https://stackoverflow.com/questions/70904460

QUESTION

Difference in Perl regex variable $+{name} and $-{name}

Asked 2022-Jan-18 at 09:12

What is the difference between Perl regex variables $+{name} and $-{name} when both are used to refer to the same regex group from Perl statement/expression code?

...

ANSWER

Answered 2022-Jan-18 at 06:36

While $+{name} holds the captured substring referred by name as a scalar value, $-{name} refers to an array which holds capture groups with the name.
Here is a tiny example:

Source https://stackoverflow.com/questions/70750715

QUESTION

Combine 2 string columns in pandas with different conditions in both columns

Asked 2021-Dec-21 at 13:18

I have 2 columns in pandas, with data that looks like this.

...

ANSWER

Answered 2021-Dec-19 at 18:10

We can get the expected result using split like so :

Source https://stackoverflow.com/questions/70413959

QUESTION

Lookaround regex and character consumption

Asked 2021-Dec-20 at 12:26

Based on the documentation for Raku's lookaround assertions, I read the regex / / as saying "starting from the left, match but do not not consume one character that is a, b, or c and, once you have found a match, match and consume one alphabetic character."

Thus, this output makes sense:

...

ANSWER

Answered 2021-Dec-20 at 12:26

and does not seem to support some backslashed character classes. \n, \s, \d and \w show similar results.

behaves the same as <[abc\s]> when \n, \s, \d or \w is added.

\t, \h, \v, \c[NAME] and \x61 seem to work as normal.

Source https://stackoverflow.com/questions/69004383

QUESTION

Parsing binary files in Raku

Asked 2021-Nov-09 at 11:34

I would like to parse binary files in Raku using its regex / grammar engine, but I didn't found how to do it because the input is coerce to string.

Is there a way to avoid this string coercion and use objects of type Buf or Blob ?

I was thinking maybe it is possible to change something in the Metamodel ?

I know that I can use unpack but I would really like to use the grammar engine insted to have more flexibility and readability.

Am I hitting an inherent limit to Raku capabilities here ?

And before someone tells me that regexes are for string and that I shouldn't do it, it should point out that perl's regex engine can match bytes as far as I know, and I could probably use it with Regexp::Grammars, but I prefer not to and use Raku instead.

Also, I don't see any fundamental reason why regex should be reserved only to string, a NFA of automata theory isn't intriscally made for characters instead of bytes.

...

ANSWER

Answered 2021-Nov-09 at 11:34

Is there a way to avoid this string coercion and use objects of type Buf or Blob ?

Unfortunately not at present. However, one can use the Latin-1 encoding, which gives a meaning to every byte, so any byte sequence will decode to it, and could then be matched using a grammar.

Also, I don't see any fundamental reason why regex should be reserved only to string, a NFA of automata theory isn't intriscally made for characters instead of bytes.

There isn't one; it's widely expected that the regex/grammar engine will be rebuilt at some point in the future (primarily to deal with performance limitations), and that would be a good point to also consider handling bytes and also codepoint level strings (Uni).

Source https://stackoverflow.com/questions/69892053

QUESTION

Regex to match nothing but zeroes after the first zero

Asked 2021-Nov-03 at 11:42

Using regular expressions, how can I make sure there are nothing but zeroes after the first zero?

...

ANSWER

Answered 2021-Nov-03 at 11:42

You could update the pattern to:

Source https://stackoverflow.com/questions/69798705

QUESTION

python regex where a set of options can occur at most once in a list, in any order

Asked 2021-Nov-03 at 10:04

I'm wondering if there's any way in python or perl to build a regex where you can define a set of options can appear at most once in any order. So for example I would like a derivative of foo(?: [abc])*, where a, b, c could only appear once. So:

...

ANSWER

Answered 2021-Oct-08 at 07:56

You may use this regex with a capture group and a negative lookahead:

For Perl, you can use this variant with forward referencing:

Source https://stackoverflow.com/questions/69486648

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

Vulnerabilities

No vulnerabilities reported

Install regex

You can download it from GitHub.
Rust is installed and managed by the rustup tool. Rust has a 6-week rapid release process and supports a great number of platforms, so there are many builds of Rust available at any time. Please refer rust-lang.org for more information.

Support

[Module documentation with examples](https://docs.rs/regex). The module documentation also includes a comprehensive description of the syntax supported. Documentation with examples for the various matching functions and iterators can be found on the [Regex type](https://docs.rs/regex/*/regex/struct.Regex.html).

Find more information at: