Tag：pattern matching
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Time：2021-11-9
preg_ match_ All function: int preg_ match_ All (string pattern, string subject, array matches [, int flags]) performs a global regular expression matchSearch the subject for all the contents that match the regular expression given by pattern, and put the results into matches in the order specified by flags.After the first match is found, the […]
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Time：2021-10-16
preface This article introducesOpenRestyTwo kinds ofregularpattern matching。 First of all, the openresty suite contains two kinds of syntax: one is the openresty syntax mainly based on the FFI API, and the other is the syntax similar to the native Lua scripting language. In the content introduced in this article, the regular pattern matching corresponding to […]
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Time：2021-9-14
Since C #7.0, pattern matching has been evolving as an important new feature of C # continuously. Drawing lessons from the concept of functional programming of his younger brother f #, C # has more and more abilities. C #9.0 has further enhanced the function of pattern matching. In order to have a more in-depth […]
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Time：2021-9-1
New feature of c# 9 — enhanced pattern matching Intro The usage of pattern matching is further enhanced in c# 9, which makes pattern matching more powerful. Let’s take a look Sample The usage of pattern matching is enhanced in c# 9, andand/or/notOperator, and you can directly judge attributes. Take the following example: var person […]
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Time：2021-8-23
Pattern matching is often used in rust. Match expression is the most commonly used expression for pattern matching The match expression is roughly divided into three parts: match keyword, head expression and match block. This article mainly discusses how to write head expression Head expression As we know, there are only two expressions in rust:Position […]
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Time：2021-8-12
str.match(regexp) The method str.search (regexp) returns the location of the first match, or – 1 if it is not found var result = ‘javascript’.search(/script/) console.log(result) // 4 str.replace(str|regexp,str|func) The method str.replace (str|regexp, str|func) is used to perform retrieval and replacement operations. If the modifier G is set in the regular expression, all substrings matching the […]
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Time：2021-3-29
Out variable You can use out to declare variables directly in a methodint.TryParse(“123”, out var result); tuple Declaration of tuples var alphaBetaStart = (alpha: “a”, beta: “b”); Console.WriteLine($”{alphaBetaStart.alpha}{alphaBetaStart.beta}”); Deconstruction and tuple private class User { public string Name { get; } = “Bob”; public string Email { get; } = “[email protected]”; public int Age { […]
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Time：2021-3-24
readonly member private struct Point { public Point(double x, double y) { X = x; Y = y; } private double X { get; set; } private double Y { get; set; } private readonly double Distance => Math.Sqrt(X * X + Y * Y); public override readonly string ToString() => $”({X}, {Y}) is {Distance} […]
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Time：2021-3-9
If let syntax allows you to combine if and let in a less lengthy way to handle values that match one pattern, ignoring the rest. For example, the program matches the option < U8 > value, but only wants to execute the code when the value is 3: fn main() { let some_u8_value = Some(0u8); […]
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Time：2021-1-31
0. Preface Type checking and type conversion are implemented in each language, such asJava IninstanceofandisInstance Of course, Scala also has, but compared with other languages,Scala In order to simplify the development, a powerful pattern matching is produced. Its principle and application are introducedJavaInswitch-caseIt is very similar, but its matching ability is stronger. It can not […]
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Time：2020-10-17
1 mode 1.1 character class The character class represents a set of characters. You can use the following combinations to represent a character class. combination For letters Representative character type x (variable x) ^$()%.[]*+-?Any character other than . （dot） Any character %a （alphabet） letter %b （bracket） Symmetrical characters and the contents between characters %c （control） […]
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Time：2020-9-23
preface Regular expression and pattern matching are the main knowledge used by the front-end when processing strings. This part of the notes are made with XMIND, so paste the contents of the notes directly.(click on the picture and click on the view image below to see a large and clear picture.) text
