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                通過使用分組,特定信息可以被從一個匹配的字符串中提取。如果 match() 返回 true,我們可以使用 matched(X) 方法過的分組,X是正則表達似乎模式定義的分組的號碼: ~~~ class Main { static function main() { var str = "Nicolas is 26 years old"; var r = ~/([A-Za-z]+) is ([0-9]+) years old/; r.match(str); trace(r.matched(1)); // "Nicolas" trace(r.matched(2)); // "26" } } ~~~ 注意,分組號從1開始,r.matched(0) 總是返回整個匹配的子串。 r.matchedPos() 返回這個子串在原字符串中的位置: ~~~ class Main { static function main() { var str = "abcdeeeeefghi"; var r = ~/e+/; r.match(str); trace(r.matched(0)); // "eeeee" // { pos : 4, len : 5 } trace(r.matchedPos()); } } ~~~ 另外,r.matchedLeft() 和 r.matchedRight() 可以用來獲得匹配的子串左側或者右側的子串: ~~~ class Main { static function main() { var r = ~/b/; r.match("abc"); trace(r.matchedLeft()); // a trace(r.matched(0)); // b trace(r.matchedRight()); // c } } ~~~
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