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PODynamic string parsing in Powershell
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5035019
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2011-02-17T21:41:19.250
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2013-06-26T04:14:03.287
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I'm trying to do something unusual with Powershell parsing. Basically, I have a literal string that contains the name of a variable. What I would like to do is tell powershell "Hey, I've got a string that (may) contain one or more variable names--dynamically parse it, replacing the variable names with their values" Here's the textbook way I understand parsing works: <pre><code>PS C:\> $foo = "Rock on" PS C:\> $bar = "$foo" PS C:\> $bar Rock on </code></pre> And if I now change the value for $foo: <pre><code>PS C:\> $foo = "Rock off" PS C:\> $bar Rock on </code></pre> No surprises here. The value of $bar was parsed as it was assigned, and didn't change simply because the value of $foo changed. Ok, so What if we assign $bar with a single quote? <pre><code>PS C:\> $foo = "Rock on" PS C:\> $bar = '$foo' PS C:\> $bar $foo </code></pre> That's great, but is there a way to get Powershell to parse it on demand? For example: <pre><code>PS C:\> $foo = "Rock on" PS C:\> $bar = '$foo' PS C:\> $bar $foo PS C:\> Some-ParseFunction $bar Rock on PS C:\> $foo = "Rock off" PS C:\> Some-ParseFunction $bar Rock off </code></pre> Why do I want to do this? I would like to be able to get content from a file (or some data source) and dynamically parse it: <pre><code>PS C:\> $foo = "Rock on" PS C:\> '$foo with your bad self.' | out-file message.txt PS C:\> $bar = (get-content message.txt) PS C:\> $bar $foo with your bad self. PS C:\> Some-ParseFunction $bar Rock on with your bad self. </code></pre> Can this be done? I realize I could do some pattern matching for search/replace for known names, but I'd rather have Powershell reparse the string. Thanks!
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<parsing><powershell>
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Dynamic string parsing in Powershell
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