07.05.2018 12:19, Gabor Boros mlngl...@bgss.hu [firebird-support] wrote: > A simple example: SELECT ''='' SIMILAR TO '[A-Z]{2}[0-9A-Z]{2,13}' FROM > RDB$DATABASE > > Why is the result true?
Your expression is actually calculated as "CAST(''='' as CHAR(5)) SIMILAR TO '[A-Z]{2}[0-9A-Z]{2,13}'". (''='') is true and string representation of true is 'TRUE ' that matches your patters. -- WBR, SD. ------------------------------------ ------------------------------------ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Visit http://www.firebirdsql.org and click the Documentation item on the main (top) menu. Try FAQ and other links from the left-side menu there. Also search the knowledgebases at http://www.ibphoenix.com/resources/documents/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------ Yahoo Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/firebird-support/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/firebird-support/join (Yahoo! ID required) <*> To change settings via email: firebird-support-dig...@yahoogroups.com firebird-support-fullfeatu...@yahoogroups.com <*> To unsubscribe from this group, send an email to: firebird-support-unsubscr...@yahoogroups.com <*> Your use of Yahoo Groups is subject to: https://info.yahoo.com/legal/us/yahoo/utos/terms/