Regular Expressions for begineers This topic contains 2 replies, has 2 voices, and was last updated by ShirleyB 3 years, 3 months ago. Author Posts December 19, 2014 at 5:12 am #21334 ShirleyBParticipant Totally bemused by regular expressions i.e. "book" -match 'i?' ...what is the point ?? The PowerShell help says of '?'...... "Matches one instance of the preceding character." But the above example returns a "True" I must be missing something !! December 19, 2014 at 5:33 am #21335 Daniel KrebsModerator The question mark quantifier makes the preceding token optional in your example the i. You could write "book" -match " to get the same result. Check out http://www.regular-expressions.info/optional.html for more examples on the question mark quantifier. December 19, 2014 at 5:51 am #21336 ShirleyBParticipant Thanks Daniel. I get it now. The examples given in the MS Powershell online help do not always give particularly good example of regex from a beginners perspective. Mind you, even the online help is a great deal better than some manuals I could mention ! Author Posts You must be logged in to reply to this topic.