Delphi Regular Expression Syntax (9): Critical match-also called "Pre-search" and "reverse pre-search"

Delphi Regular Expression Syntax (9): Critical match-also called "Pre-search" and "reverse pre-search"

//Match right var reg:tperlregex; begin Reg: = tperlregex.create (nil' Delphi 6; Delphi 7; Delphi 2007;  Delphi Net '; Reg. RegEx  ' delphi (? =2007) '//? ='//Return: Delphi 6; Delphi 7; ; Delphi Net Freeandnil (reg); End;

//Mismatch to the right var reg:tperlregex; begin Reg: = tperlregex.create (nil' Delphi 6; Delphi 7; Delphi 2007;  Delphi Net '; Reg. RegEx  ' Delphi (?! ) '//?! "' //return: 6; 7; Delphi 2007; Net Freeandnil (reg); End;

//Match left var reg:tperlregex;  begin Reg: = tperlregex.create (nil' 111, 222,￥333,￥444 '; Reg. RegEx  ' (? <=￥) \d{3} '//? <='//return: 111, 222,￥,￥ Freeandnil ( REG); End;

//Do not match left var reg:tperlregex;  begin Reg: = tperlregex.create (nil' 111, 222,￥333,￥444 '; Reg. RegEx  ' (? <!￥) \d{3} '//? <! "'  //return:,,￥333,￥444 Freeandnil (REG); End;

Delphi Regular Expression Syntax (9): Critical match-also called "Pre-search" and "reverse pre-search"