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How to pass regex options to powershell [ regex ]?


Asked by Ophelia Allison on Dec 10, 2021 FAQ



Use PowerShell's -match operator instead. By default it is case-insensitive: For case-sensitive matches, use -cmatch. You can also include (?i) in your regex, like so (cmatch forces case sensitive match): After using [regex] type accelerator, Options property is ReadOnly and can't be changed.
In this manner,
$regex = [regex] '\W+' compiles the regular expression \W+ (which matches one or more non-word characters) and stores the result in the variable $regex. You can now call all the methods of the Regex class on your $regex object. Splitting a string is a common task for which PowerShell does not have a built-in operator.
In respect to this, PowerShell provides a handy shortcut if you want to use the Regex() constructor that takes a string with your regular expression as the only parameter. $regex = [regex] '\W+' compiles the regular expression \W+ (which matches one or more non-word characters) and stores the result in the variable $regex.
And,
The -replace operator uses a regular expression to search-and-replace through a string. E.g. 'test' -replace 'w', '$&$&' returns 'tteesstt'. The regex w matches one letter. The replacement text re-inserts the regex match twice using $&. The replacement text parameter must be specified, and the regex and replacement must be separated by a comma.
Also,
So all versions of PowerShell use the same regex syntax. Windows PowerShell 2.0 and 5.0 added some features that make it easier to split strings and invoke other Regex () constructors. Other than that, there are no differences between any of the PowerShell versions regarding the use of regular expressions.