perlfunc | Python module for calling perl functions from python | Monitoring library
kandi X-RAY | perlfunc Summary
kandi X-RAY | perlfunc Summary
Python module for calling perl functions from python. Just declare and decorate an empty python function and it will invoke your perl function and return the results. Read more at:
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Trending Discussions on perlfunc
QUESTION
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 00:03You 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:
QUESTION
Sometimes I get bitten from really basic things. I recalled having different split behavior based on using PATTERN as a string or a regex. Now reading documentation seems there is no such distinction, in whole docs there is just one case (awk-like behavor) where the pattern is presented as quoted string, in every other example the pattern is between slashes, as a regex. Still, I found examples/tutorials here and there, for example, where is mentioned distinction of character, string and pattern based split. Still, in tests I did not found more differences besides when splitting on the slash is nicer to use quotes (split '/', $some_string).
My specific problem today was splitting filenames on dot . and expecting to split on string-pattern. For my surprise the pattern '.' was still treated as regex, so the following script fails for this purpose:
ANSWER
Answered 2020-Jan-07 at 15:25No matter what syntax you use, split's first operand must evaluate to a regex pattern.[1]
As such, split '.' and split /./ both split on the regex pattern ., meaning that the strings to return are separated by any character but a newline.
Do note that single-quoted string literals ('...', q'...', q!...!, q{...}, etc), double-quoted string literals ("...", qq"...", qq!...!, qq{...}, etc), and regex literals (qr/.../, /.../, m/.../, s/...//, etc) have different parsing rules. For example split "\+" and split /\+/ will have different effects, but only because "\+" is the just a weird way of writing "+".
I recommend always using a match operator (e.g. /.../) or a qr operator (e.g. qr/.../) over a string literal (except for ' ', of course). These are best suited to construct a regex pattern, and these signal to your reader that you are producing a regex pattern.
Two exceptions:
A match operator is treated as a regex-string literal. For example,
/.../is treated asqr/.../.An expression that evaluates to a string that consists of a single space (
' 'and" ", but not/ /orqr/ /) means that the strings to return are separated by whitespace and that leading whitespace should be ignored.
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Install perlfunc
You can use perlfunc like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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