Delphi Regular Expression Syntax (7): Match escape character

Delphi Regular Expression Syntax (7): Match escape character

The meaning of the//? is to match 0-1 times, what if a match is needed? var reg:tperlregex;  begin Reg: = tperlregex.create (nil' How are you? ' OK! ') Reg. RegEx  ' \?|! ' ///Gar use of \ "'  //return: How are you, okay? Freeandnil (REG); End;

//random escape symbols \ Sometimes yes, but sometimes problems, better not to mess with var reg:tperlregex;  begin Reg: = tperlregex.create (nil' How are you? ' OK! ') Reg. RegEx  ' \?| \!| \ Good '//Give unnecessary! "and" good "added \ In this example also normal "//return: You're okay . Freeandnil (REG); End; {There would have been an option [Preextra] to prohibit the use of chaos, but the effect is not good}

Special character list in regular expressions:

Special characters	Meaning in regular expressions	Match the character itself
^	Matches the beginning of a string, or does not match the contents of []	\^
$	Match the end of a string	\$
and	Marker sub-expression	\ (and \)
and	Expressions that match "multi-character"	\[and \]
and	Symbol for number of matches	\{and \}
.	Match all characters except line break	\.
?	Match 0 or 1 times	\?
+	Match at least 1 times	\+
*	Match 0 or more times	\*
|	Or	\|
\	Escape symbol itself	\\

Delphi Regular Expression Syntax (7): Match escape character