Re: Quick Regex Question
От | Terry Fielder |
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Тема | Re: Quick Regex Question |
Дата | |
Msg-id | 476A5908.8010404@ashtonwoodshomes.com обсуждение исходный текст |
Ответ на | Re: Quick Regex Question (Howard Cole <howardnews@selestial.com>) |
Ответы |
Re: Quick Regex Question
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Список | pgsql-general |
<Snip> Howard Cole wrote: >> > Hi Marijn, Andreas, > > I think Andreas is right, note the ordering of characters in the above > example as [ ^] rather than [^ ]. > So if the '^' is taken as literal '^', can I check for the beginning > of a string in the brackets, Why do you need to? Check for the beginning of the string BEFORE the set brackets. The point of set brackets is "match from a set of chars". Since "beginning of string" can only match one place, it has no meaning as a member of a set. Or in other words, if it has meaning, it needs to be matched FIRST out of the set, and therefore you can just remove from the set and put before the set brackets. > or am I forced to use the (^| ) syntax? > > Is it just me or are regular expressions crazy? Complicated, not crazy. Terry > > Howard > > ---------------------------(end of broadcast)--------------------------- > TIP 9: In versions below 8.0, the planner will ignore your desire to > choose an index scan if your joining column's datatypes do not > match >
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