溶液
パターンマッチング機能を使う
source = "this is a racecar and ere noon stressed desserts for Stanley Yelnats saw Anna was there";
palindrome = (Pat Regex( "[a-zA-Z][a-zA-Z ]{0,999}" )) >> firstpart + // one or more first letters
(Pat Regex( "[a-zA-Z ]{0,1}" )) + // optional middle letter
Expr( Reverse( firstpart ) ); // the tail
list = {}; // places to
positions = {}; // keep results
Pat Match(
source,
Pat Repeat( // repeat *is* a loop, within the source string
(Pat Pos() >> location + // capture current position in string
palindrome >> another + // capture the text of the palindrome match
Pat Test( // this function runs some JSL to see if the current position matches
Insert Into( list, another );// the JSL saves
Insert Into( positions, location );// two answers
1 // pattest returns 1(OK) because we are not actually testing anything...just wanted to run some JSL
)//
)
| // above adds to list, below skips forward a letter to try again
Pat Len( 1 ) // this bit is more important than it looks; it matches all the text that isn't interesting
)
);
Show( list, positions );
list = {"レースカーa"、"ere"、"正午"、"ストレスの多いデザート"、"Stanley Yelnats"、"Annaが見た"、"ere"};
位置＝ ｛８、２２、２６、３１、５３、６９、８４｝。
討論
PatRepeatは、可能な限りパターンを繰り返すパターンマッチング機能です。目的のパターンの別のインスタンスが見つかるまで一度に1文字を無視できるPatLen（1）の代替手段がないと、不要なテキストをスキップすることはできません。
本当に簡単なパターンも使えます。
source = "this is a racecar and ere noon stressed desserts for Stanley Yelnats saw Anna was there";
reallysimple = "is";
list = {}; // places to
positions = {}; // keep results
Pat Match(
source,
Pat Repeat( // repeat *is* a loop, within the source string
(Pat Pos() >> location + // capture current position in string
reallysimple >> another + // capture the text of the match
Pat Test( // this function runs some JSL to see if the current position matches
Insert Into( list, another );// the JSL saves
Insert Into( positions, location );// two answers
1 // pattest returns 1(OK) because we are not actually testing anything...just wanted to run some JSL
)//
)
| // above adds to list, below skips forward a letter to try again
Pat Len( 1 ) // this bit is more important than it looks; it matches all the text that isn't interesting
)
);
Show( list, positions );
list = {"is"、"is"};
位置= {2、5}。
