is it possible to form with the .net Regex class backtracking expressions?
is it for example possible, creating a regex which forms braces like in ari开发者_开发问答thmetic formulars? like it would accept ( ), ( ( ) ((()())), but not ((, (()(), ()))?
Yes, it is possible, but it's not called backtracking.
You're looking for Balancing Group Definitions.
Backtracking is completely different.
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It seems to me Apple won\'t allow this, but I need to make sure. For an app we\'re building, we want to ask the user to enter payment information (including credit card details) to pay for tickets. T
I need to generate an XML output using Perl code.I\'m trying not to use any libraries,as it\'s very simple, temporary XML that gets used by another step in the process.
是否在对方手机上显示已读，是由用户自行设置的。依次打开iPhone的“设置-信息”，会有一个“发送已读回执”的选项。将其打开，对方就能看到你，是否已经阅读了本条iMessage信息。将其关闭，对方就看不到。
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