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.
To change the match mode within pattern.
Group will not capture what it matched, only to combine sub-expressions.
More convenient character boundary condition.
Will match the substring that a standalone pattern would match.
According to a certain condition, conditional expression matches one of two options.
To refer to another part of expression itself, not to refer to what is captured.