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How to extract the hostname from a URI that includes a username and password in Perl?

regex perl ssrf

Can optimizing compiler deduplicate functions with identical assembly?

c assembly optimization

Why do we need condition variables when we can use two semaphores?

storing an R function output list in a column of lists for further processing

r list dplyr

C macro expansion order (need to understand why) [closed]

c c-preprocessor

Why does template deduction for a nested std::array with one element result in a one dimensional std::array?

Cannot understand the behaviour of pandas case_when used on Series with different indexes

python pandas series

How does Haskell understand this function? Weird behavior

haskell

excel - Find all rows that have 2 out of 3 columns in common, combine with the uncommon column of each to make 4 column rows

excel excel-formula

Why does this va_start crash?

c++

Can the name of a template parameter shadow the name of a member of that class?

c++ language-lawyer

Move ggplot legend into title area

r ggplot2 cowplot grob

Use UnsafeCell to get around rules for uninitialized memory

rust unsafe

Why is pandas not formatting dates with date_format?

python pandas csv date

GNU ld - Don't allow multiple definitions (function symbols) or at least warn when found in single archive (*.a)

Can I instantiate an object in PowerShell and set a property in a single command?

How does PCRE \p{N} define a "numeric character"

regex unicode pcre pcre2

Can there be a non-visual (without dfm) base form between TForm and any other form of the app?

Replace NA values in R dataframe across multiple columns using truncated names of other columns [duplicate]

r dataframe dplyr na

Correct interpretation of clause 6.5 Expressions in the draft C standard

c strict-aliasing