Recent questions tagged pattern

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pattern matching - Should a reference to an enum be dereferenced before it is matched?

As a newcomer to Rust, I've stumbled upon two apparently valid ways of running a match on a reference ... were matching more complex objects? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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477 views

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pattern matching - SQL select where column begins with

I'm trying to find all the data in ColumnX where the Data begins with a . Is like '\%' what I'm looking for? But the has to be at the beginning. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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433 views

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pattern matching - Python, how to implement something like .gitignore behavior

I need to list all files in the current directory (.) (including all sub directories), and exclude some files ... of my "ignore_files"? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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320 views

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pattern matching - Regex to match simple domain

I am trying to match a simple domain: example.com But all combinations of it. How would I do this to cover: ... com http://www.example.com etc. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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374 views

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pattern matching - Can a range be matched in Scala?

Is it possible to match a range of values in Scala? For example: val t = 5 val m = t match { 0 until ... any way to achieve something like it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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465 views

1 answer

pattern matching - How to suppress "match is not exhaustive!" warning in Scala

How can I suppress the "match is not exhaustive!" warning in the following Scala code? val l = "1" :: ... I can safely suppress the warning. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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352 views

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pattern matching - How to match over self in an enum?

I have an enum: enum Expr { Lit(u32), Var(Id), Ass(Id, u32), Add(u32, u32), Sub(u32, u32), Mul(u32, ... I have no idea how to do this properly. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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402 views

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pattern matching - How to generate a number sequence in file using vi or Vim?

Is there a way to generate a number sequence in vi or Vim? For example, for an arbitrary range of lines i ?through ... , but it is not the same. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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405 views

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pattern matching - Can I match a data constructor wildcard in Haskell?

I have data Foo = X (String, Int) | A String | B String | C String | D String -- ... and ... to match a data constructor wildcard in Haskell? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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555 views

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pattern matching - How do I create a Rust macro with optional parameters using repetitions?

I'm currently looking into Rust macros and I can not find any detailed documentation on repetitions. I would like ... get this example to work? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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773 views

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pattern matching - notepad++ Inverse Regex replace (all but string)

I essentially wish to match every line that DOES NOT contain this string "Hello" Example: sdfsdoifdoskf ... hello" using notepad++ See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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