Well, to begin with, in your second example, you don't put a \ before the d+. But let's assume that you meant to: The trick to this is to realize that the shell does not interpolate single quotes(') just like perl so always remember to do this: 

perl -le '$PATH="test"; print $PATH'

#outputs: test

[download]

rather than: 

perl -le "$PATH='test'; print $PATH"

#which gives and error when it interpolates $PATH to the 
#environment variable in the assignment operator

[download]

HTH

Addendum: Strike that, too early in the morning, can't regex just anywhere like other's have stated. The rest is valid and possibly useful even.

In reply to Re: Acceptable regular expressions within command line type syntax by pzbagel
in thread Acceptable regular expressions within command line type syntax by Hagbone

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