Powershell replace text in file with variable

Scripting Forums. PowerShell Forums. PowerShell on TechCommunity. March 21st, As the Windows ScriptingGuy1 March 22, I am looking ScriptingGuy1 March 23, NET Core. Recordset ADOR. Paste your code snippet. Hash table is a type of an array, which stores values as key value pair.

The key values must be unique, and values can be non-unique. The built-in properties of a hash table are key, value and count. In the case of replacing text using hash table, the key would represent the text to be replaced and the value would represent the text value to be used for replacement. I work as a freelancer. This is my hobby. This is an example. Example of replacing numbers.

Split "-". PowerShell Replace operator provides much flexibility as it uses regular expressions that match and replace expression patterns. Cool Tip: Do you know how to print environment variables in PowerShell!

PowerShell replace operator returns modified string after string operation. We can chain together and call to replace the operator to perform multiple replacements in a string. While using PowerShell regular expression with replace operator, it has some pitfalls if regular expressions contain special characters or regex characters.

In the above example, we want to replace [Shell] with PowerShell , but the outcome of the above command is not as per what we want. As the [Shell] contains regex special characters inside the search string, a correct replacement will not work. To avoid this problem, you have two options.

You can either escape these special characters by prepending a backslash to the front of each character or use the Escape method. In all of the previous examples, this tutorial has been using a literal string to replace another string with. But what if you want to use one or more characters that PowerShell found in the string to replace with? Regex has a concept called capture groups and backreferences.

Capture groups allow you to capture strings to then reference elsewhere. PowerShell leverages this features by using match groups with the replace operator. To perform this action, PowerShell must find all of the text to the right and left of the comma. Once it knows what that text is, it must then replace one with the other. To do that, you need backreferences. A backreference is a regex variable not a PowerShell variable that represents the text that regex matched.

Backreferences in PowerShell are represented with a dollar sign followed by a number indicating the order in which they were matched. In the above example, you can see regex capture groups enclosing each match hello world and you sexy beast with parentheses.

Instead of having to count from left to right which references mean what, you can simply use names. To use names as references, you need to first define labels for each match in the match string. To do that, you must define the capture group like?