![]() Let’s look at a few more examples of regex commands. Value=TRUE prints the value itself grep("A", month.name, value=TRUE)īoth of these should return the names of the months that start with ‘A’ To return the actual name, you can use the following statements: The grep function described above would return the indices of a positive match, in this case >4 8 We are searching for the capital A and returning the matches. The grep function can be used to find and return the index of a match in a string. month.name is a small dataset that contains the names of each month. ![]() To understand the general methods for using regex in R, you can open the help page by running this command ?regexpĮxample: we will be using a vector, month.name and performing some searches on the values. You can use the functions below to do so. When working with a large dataset, it may be useful to perform large scale searches, find patterns and perform substitutions. My actual code is as follows: $planCheck = az appservice plan list -query "" | ConvertFrom-JsonĪz appservice plan create -n $aspName -g $rsgName -sku S1 -location $regionNameĬreative Commons Attribution-ShareAlike 4.Regular expressions are used to search for a particular statement within an input string. So here, we can use if statement to check this real Boolean type, rather than using -eq to check string equality as before. Note that True and False are the real Boolean types here, while the exists command that comes with Azure CLI returns a string of 'true' or 'false'. Thus, we can determine whether an App Service Plan exists by checking whether the returned array object length is greater than zero: ![]() Fortunately, PowerShell comes with a very convenient conversion method: ConvertFrom-Json The return format of the Azure CLI is a JSON string, it needs to be converted to an object before it can be recognized by PowerShell for subsequent actions. And you can filter the App Service Plan by criteria, such as by name: az appservice plan list -query ""įor non-exist App Plan, the result is empty: az appservice plan list -query "" In the case of Windows PowerShell, executing az appservice plan list lists all the App Service Plan under your current subscription. Now that Azure CLI doesn't provide native exists support for some resource types, we can only make our own, use the commands we have to find the resource by name, and check whether the number of returned results is greater than zero to determine whether the resource exists. Up to the latest version of 2.1 CLI, where App Service Plan does not have exists directive: However, not every Azure resource provides the exists directive. For example, our script can determine whether a resource group exists before creating it: $rsgExists = az group exists -n $rsgNameĪz group create -l $regionName -n $rsgName Current Situationįor some resource types, such as Resource Group, Azure CLI provides exists directive that can return the existence of a resource. However, Azure CLI still has some features that are not convenient enough, such as checking the existence of resources. Ideally, for repetitive tasks, using CLI scripts can help us save time. ![]() Azure CLI can help us automate the configuration and management tasks of Azure. ![]()
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