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                ## 邊界符 ## ^ 開頭 表示字符串必須以^后面的內容作為開頭。 ## $ 結尾 表示$前面匹配的結果必須位于字符串最后。 正則表達式中邊界符不一定非要寫 // ^一定是出現在第一個定界符后面 $ 一定是出現在第二個定界符前面 ``` /^ $ / ``` //邊界符可以兩個同時出現
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