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Match Tool 2.1

Match Tool 3.0


DEELX Extended Syntax

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DEELX supports most of the extended syntax of Perl. In details, the extended syntax may be a little different in engines. So, read this chapter before you use them.


     Add remarks in regular expression pattern, to let the pattern more readable.

Mode modifier
     To change the match mode within pattern.

Non-capture group
     Group will not capture what it matched, only to combine sub-expressions.

Zero-width assertion
     More convenient character boundary condition.

Independent expression
     Will match the substring that a standalone pattern would match.

Conditional expression
     According to a certain condition, conditional expression matches one of two options.

Recursive expression
     To refer to another part of expression itself, not to refer to what is captured. © 2005 - All Rights Reserved