pattern-matching Archives

Programming, scala

IT Nursery

What does `:_*` (colon underscore star) do in Scala?

I have the following piece of code from this question: def addChild(n: Node, newChild: Node) = n match { case Elem(prefix, label, attribs, ...

May 27, 2022
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Count character occurrences in a string in C++

How can I count the number of "_" in a string like "bla_bla_blabla_bla"? 13 Answers 13

May 21, 2022
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How can I tell if a string repeats itself in Python?

I’m looking for a way to test whether or not a given string repeats itself for the entire string or not. Examples:...

May 11, 2022
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How can I use inverse or negative wildcards when pattern matching in a unix/linux shell?

Say I want to copy the contents of a directory excluding files and folders whose names contain the word ‘Music’. cp...

May 11, 2022
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What is the difference between “x is null” and “x == null”?

In C# 7, we can use if (x is null) return; instead of if (x == null) return; Are there any advantages to ...

May 5, 2022
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Regular expression to match a line that doesn’t contain a word

I know it’s possible to match a word and then reverse the matches using other tools (e.g. grep -v). However, is it possible ...

April 9, 2022
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