match | 易学教程

【PHP】PHP7新特性

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PHP7新特性 PHP7.0 PHP7.0新特性 PHP7.0 变化 PHP7.1 PHP7.1新特性 PHP7.1变化 PHP7.2 PHP7.2新特性 PHP7.2变更 PHP7.3 PHP7.3新特性 PHP7.3变化 PHP7.0 PHP7.0新特性组合比较符 (<=>) 组合比较符号用于比较两个表达式。当$a小于、等于或大于$b时它分别返回-1、0或1，比较规则延续常规比较规则。对象不能进行比较。 var_dump ( 'PHP' <= > 'Node' ) ; // int(1) var_dump ( 123 <= > 456 ) ; // int(-1) var_dump ( [ 'a' , 'b' ] <= > [ 'a' , 'b' ] ) ; // int(0) null合并运算符由于日常使用中存在大量同时使用三元表达式和isset操作。使用null合并运算符可以简化操作。 # php7以前 if ( isset ( $_GET [ 'a' ] ) ) { $a = $_GET [ 'a' ] ; } # php7以前 $a = isset ( $_GET [ 'a' ] ) ? $_GET [ 'a' ] : 'none' ; #PHP 7 $a = $_GET [ 'a' ] ? ? 'none' ; 变量类型声明变量类型声明有两种模式。一种是强制的

计算器work_day05

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day_work_05 ------Python是一个优雅的大姐姐作业计算器设计思路按照运算优先级和正则先算括号内的值，提出来判断符号问题，然后依次计算。分析题目设计了四个函数，分别为a）去括号函数b）去符号函数c）去乘除号函数d）去加减号函数各个函数之间实行调用，完美解决问题，可能会有bug。运行代码 # Author:Xiong # 开发一个简单的python计算器 # 实现加减乘除及拓号优先级解析 # 用户输入 1 - 2 * ( (60-30 +(-40/5) * (9-2*5/3 + 7 /3*99/4*2998 +10 * 568/14 )) - (-4*3)/ (16-3*2) ) # 等类似公式后，必须自己解析里面的(),+,-,*,/符号和公式(不能调用eval等类似功能偷懒实现)， import re def remove_04(str_4): print( '****** 去掉符号重复******' ) flag = True while flag: flag = False if str_4.find( '*+' ) != -1: str_4 = str_4.replace( '*+' , '+' ) flag = True if str_4.find( '+-' ) != -1: str_4 = str_4.replace( '+-' , '-

JS/Jquery, Match not finding the PNG = match('/gif|jpg|jpeg|png/')

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问题 I have the following code which I use to match fancybox possible elements: $('a.grouped_elements').each(function(){ var elem = $(this); // Convert everything to lower case to match smart if(elem.attr('href').toLowerCase().match('/gif|jpg|jpeg|png/') != null) { elem.fancybox(); } }); It works great with JPGs but it isn't matching PNGs for some reason. Anyone see a bug with the code? Thanks 回答1: A couple of things. Match accepts an object of RegExp , not a string. It may work in some browsers,

JS/Jquery, Match not finding the PNG = match('/gif|jpg|jpeg|png/')

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How to make a simple jQuery filter list accept only whole words, so it doesn't match partial words, only whole words

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问题 http://jsfiddle.net/nicktheandroid/U8T8p/4/ (function($) { $('.filterinput').keyup(function() { var filter = $(this).val(); if (filter.length > 2) { // this finds all links in the list that contain the input, // and hide the ones not containing the input while showing the ones that do $(list).find("a:not(:Contains(" + filter + "))").parent().slideUp(); $(list).find("a:Contains(" + filter + ")").parent().slideDown(); } else { $(list).find("li").slideDown(); } return false; }) }(jQuery)); This

How to make a simple jQuery filter list accept only whole words, so it doesn't match partial words, only whole words

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How to make a simple jQuery filter list accept only whole words, so it doesn't match partial words, only whole words

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How to match String with Pattern in Groovy

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问题 I am trying to decide whether a simple regular expression matches a string in Groovy. Here's my task in gradle. I tried to match with 2 different ways I found on the net, but neither of them works. It always prints out "NO ERROR FOUND" task aaa << { String stdoutStr = "bla bla errors found:\nhehe Aborting now\n hehe" println stdoutStr Pattern errorPattern = ~/error/ // if (errorPattern.matcher(stdoutStr).matches()) { if (stdoutStr.matches(errorPattern)) { println "ERROR FOUND" throw new

Matchlists/tables in power query

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问题 I'm thinking this has to have a simple answer, but I can't find any examples. I have to compare every member of a list to a list of substrings to see if that member contains a substring, and if it does - return the substring to a third list at the same position as the member of the first list. Example: ListA = {"help me rhonda", "in my room", "good vibrations", "god only knows"} ListB = {"room", "me", "only"} ListC should then should = {"me", "room", null, "only"} I'm an advanced programmer

What is the most efficient way to match list items to lines in a large file in Python?

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问题 I have a large file (5Gb) called my_file . I have a list called my_list . What is the most efficient way to read each line in the file and, if an item from my_list matches an item from a line in my_file , create a new list called matches that contains items from the lines in my_file AND items from my_list where a match occurred. Here is what I am trying to do: def calc(my_file, my_list) matches = [] my_file.seek(0,0) for i in my_file: i = list(i.rstrip('\n').split('\t')) for v in my_list: if