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Help! A Qustion About Regular Expression

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$aTmpStr = StringRegExp ("?Short=y",'\?(ShortCut|QuickStart|Addins|Crack|Start)=(y|n)',2)

$aTmpStr = StringRegExp ("?Short=y",'\?(ShortCut|QuickStart|Addins|Crack|Start)=(y|n)',3)

result is:

the first one -- $aTmpStr[0] = "?Short=y"

the sec one -- $aTmpStr[0] = "Short"

What cause the different?

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