Now all regex functions use ScriptRule.

The *_rule functions can now be considered deprecated
Documented this by removing mentions of the rule functions, except for a mention of backwards compatibility.

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@997 0fc631ac-6414-0410-93d0-97cfa31319b6

doc/script/best_practices.txt

@@ -23,12 +23,15 @@ Instead define a function in the init script.
 >field:
 >	script: flubble_script()
 
---Use rule form--
-If a function is available in [[script:rule form]] use it where possible.
+--Use default arguments--
 
-Many rules can be chained together using the @+@ operator.
+Many functions can be chained together using the @+@ operator.
+For these functions [[script:default arguments]] can be given.
 Have a look at @text_filter@ in the magic game file for an example.
 
+Using default arguments is especially important for functions that work on [[type:regex|regular expressions]],
+since it allows MSE to compile the regular expressions just once instead of for every call.
+
 --Don't be afraid to nest--
 Don't be afraid to nest complex things like @if@ expressions inside other expressions.
 For example the blend scripts for magic use: