replace | 易学教程

Powershell Error: Method invocation…doesn't contain a method named 'replace'

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问题 I want to search and replace a string in an xml file using PowerShell. I tried this: (gc d:\test.xml).replace('1234','xxxx')|sc d:\test.xml This works fine for my test.xml file. The content of my test.xml file is: uehjduehduhfeuf xxxxxxxx hallo "1234" But that file is only for testing. I want to edit a server.xml form my tomcat server in this way and if I'm using exactly the same command mentioned obove I get this error message: Method invocation failed because [System.Object[]] doesn't

Vue路由router示例

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使用CLI2自动化创建的项目目录： main.js: import Vue from 'vue' import App from './App' // 原本导入写法 // import router from './router/index' // 如果导入的是一个文件夹，它默认会去找index.js import router from './router' Vue . config . productionTip = false new Vue ( { el : '#app' , router , // 挂载路由 render : h => h ( App ) // 渲染App组件 } ) App.vue: < template > < div id = "app" > < h2 > 我是 APP 组件 < / h2 > < ! -- router - link是全局组件 router最终会被渲染成a标签 tag是组件类型跳转默认是pushState（可后退前进） replace表示的是replaceState ( ) 模式 -- > < ! -- < router - link to = "/home" tag = "button" replace active - class = "active" > 首页 < / router - link > -- > < ! --

PHP equivalent of Python's `str.format` method?

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问题 Is there an equivalent of Python str.format in PHP? In Python: "my {} {} cat".format("red", "fat") All I see I can do in PHP natively is by naming the entries and using str_replace : str_replace(array('{attr1}', '{attr2}'), array('red', 'fat'), 'my {attr1} {attr2} cat') Is there any other PHP's native alternatives? 回答1: sprintf is the closest thing. It's the old-style Python string formatting: sprintf("my %s %s cat", "red", "fat") 回答2: As PHP doesn't really have a proper alternative to str

Remove a character from a given position on Oracle

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问题 Is there anyway to remove a character from a given position? Let's say my word is: PANCAKES And I want to remove the 2nd letter (in this case, 'A'), so i want PNCAKES as my return. Translate doesnt work for this. Replace doesnt work for this. Regex is damn complicated... Ideas? 回答1: Example: SUBSTR('PANCAKES', 0, INSTR('PANCAKES', 'A', 1, 1)-1) || SUBSTR('PANCAKES', INSTR('PANCAKES', 'A', 1, 1)+1) I don't have an Oracle instance to test with, might have to tweak the -1/+1 to get the position

String.replace() returns unwanted string

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问题 I'm working on a piece of code where I've to split a string into individual parts and replace them. The basic logic flow of my code is, there's a string that contains a formula. The numbers below on the LHS, i.e 1, 2 and 3 are ids of different objects. Once I split them, I'd use these ids, get the respective value and replace the ids in the below String with its respective values. The string that I have is as follow - String str = "(1+2+3)>100"; I've used the following code for splitting the

MySQL replace into

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在向表中插入数据的时候，经常遇到这样的情况：1. 首先判断数据是否存在； 2. 如果不存在，则插入；3.如果存在，则更新。在 SQL Server 中可以这样处理： if not exists (select 1 from t where id = 1) insert into t(id, update_time) values(1, getdate()) else update t set update_time = getdate() where id = 1 那么 MySQL 中如何实现这样的逻辑呢？别着急！MySQL 中有更简单的方法： replace into replace into t(id, update_time) values(1, now()); 或 replace into t(id, update_time) select 1, now(); replace into 跟 insert 功能类似，不同点在于： replace into 首先尝试插入数据到表中， 1. 如果发现表中已经有此行数据（根据主键或者唯一索引判断）则先删除此行数据，然后插入新的数据。 2. 否则，直接插入新数据。要注意的是：插入数据的表必须有主键或者是唯一索引！否则的话， replace into 会直接插入数据，这将导致表中出现重复的数据。 MySQL replace

MYSQL的replace into

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replace into t(id, update_time) values(1, now()); 或 replace into t(id, update_time) select 1, now(); replace into 跟 insert 功能类似，不同点在于：replace into 首先尝试插入数据到表中， 1. 如果发现表中已经有此行数据（根据主键或者唯一索引判断）则先删除此行数据，然后插入新的数据。 2. 否则，直接插入新数据。要注意的是：插入数据的表必须有主键或者是唯一索引！否则的话，replace into 会直接插入数据，这将导致表中出现重复的数据。 MySQL replace into 有三种形式： 1. replace into tbl_name(col_name, ...) values(...) 2. replace into tbl_name(col_name, ...) select ... 3. replace into tbl_name set col_name=value, ... 第一种形式类似于insert into的用法，第二种replace select的用法也类似于insert select，这种用法并不一定要求列名匹配，事实上，MYSQL甚至不关心select返回的列名，它需要的是列的位置。例如，replace into tb1

T-SQL special characters to escape for LIKE operator wildcard search

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问题 SQL Server has the LIKE operator to handle wildcard searches. My customer wants to use the "*" (asterisk) character in the user interface of an application as the wildcard character. I'm just wondering if there are any standard characters that I need to worry about (that are used as special characters in SQL Server) besides the "%" (percent) character itself before performing a LIKE wilcard search in case their keyword contains a "%" and needs to find a "%" in the actual string. If so, what

T-SQL special characters to escape for LIKE operator wildcard search

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Regular expression that matches all valid format IPv6 addresses

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问题 At first glance, I concede that this question looks like a duplicate of this question and any other related to it: Regular expression that matches valid IPv6 addresses That question in fact has an answer that nearly answers my question, but not fully. The code from that question which I have issues with, yet had the most success with, is as shown below: private string RemoveIPv6(string sInput) { string pattern = @"(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F