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Details for command defpattern:
* deactivatepset <set number>;
* defpattern <set number>,"Regular Expression","Label";
* deletepset <set number>;
This set of commands is only available if the server is compiled with regular
expressions library enabled. Default compilation and most binary distributions
aren't, which is probably bad, since these, while complex to use, are quite

They will make the NPC object listen for text spoken publicly by players and
match it against regular expression patterns, then trigger labels associated
with these regular expression patterns.

Patterns are organised into sets, which are referred to by a set number. You can
have multiple sets patterns, and multiple patterns may be active at once.
Numbers for pattern sets start at 1.

'defpattern' will associate a given regular expression pattern with an event
label. This event will be triggered whenever something a player says is matched
by this regular expression pattern, if the pattern is currently active.

'activatepset' will make the pattern set specified active. An active pattern
will enable triggering labels defined with 'defpattern', which will not happen
by default.
'deactivatepset' will deactivate a specified pattern set. Giving -1 as a pattern
set number in this case will deactivate all pattern sets defined.

'deletepset' will delete a pattern set from memory, so you can create a new
pattern set in it's place.

Using regular expressions is high wizardry. But with this high wizardry comes
unparallelled power of text manipulation. For an explanation of what a regular
expression pattern is, see a few web pages:

For an example of this in use, see 'npc\custom\eliza.txt'.

With this you could, for example, automagically punish players for asking for
zeny in public places, or alternatively, automagically give them zeny instead if
they want it so much.

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