DEELX Basic Pattern Syntax: Escaped Characters

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Simple Escaped Characters

Some nonprinting characters which we know, for example: new line, tab etc. Some punctuations are specially defined in regular expression. To match these characters in string, add "\" in pattern.

Remarks

Escaped characters in DEELX:

Escaped	Description
\a	Bell = \x07
\f	Page = \x0C
\n	New line = \x0A
\r	Return = \x0D
\t	Tab = \x09
\v	Vertical tab = \x0B
\e	ESC = \x1B
\x20	Use 2 hex number, match the char
\u002B	Use 4 hex number, match the char
\x{20A060}	Use any hex number, match the char

Specially defined characters table:

Character	Description
^	Matches the beginning of the string. Use "\^" to match "^" itself
$	Matches the end of the string. Use "\$" to match "$" itself
( )	Grouping. Use "\(" and "\)" to match "(" and ")"
[ ]	Character class. Use "\[" and "\]" to match "[" and "]"
{ }	Define quantifiers. Use "\{" and "\}" to match "{" and "}"
.	Match any character except newline(\n). Use "\." to match "." itself
?	Let subpattern match 0 or 1 time. Use "\?" to match "?" itself
+	Let subpattern match at least 1 times. Use "\+" to match "+" itself
*	Let subpattern match any times. Use "\*" to match "*" itself
|	Alternation. Use "\|" to match "|" itself