JavaScript String Replace All – 碼人日誌 | nodejs str replace
在JavaScript使用String.replace時要注意它可能和你預期的行為不同,當你想取代某個字串時,你會發現replace只取代了第一個字串,例如“AAA”.replace(“A”,“B”),你預期會得到“BBB”但實際上你會得到的是“BAA”,這是因為JSreplace的第一個參數其實是Regex而非字串,如果你輸入字串,就只會取代第一個遇到的字串,導致和預期不同的問題。要解決JSString.replace不會取代全部字串的問題很簡單,只要用正規表達去寫即可,例如:#BBB "AAA".replace(/A/g,"B"); #HiHi "{msg}{msg}".replace(/{msg}/g,"Hi");像這樣用正規表達...
在 JavaScript 使用 String.replace 時要注意它可能和你預期的行為不同,當你想取代某個字串時,你會發現 replace 只取代了第一個字串,例如 “AAA”.replace(“A”, “B”),你預期會得到 “BBB” 但實際上你會得到的是 “BAA”,這是因為 JS replace 的第一個參數其實是 Regex 而非字串,如果你輸入字串,就只會取代第一個遇到的字串,導致和預期不同的問題。
要解決 JS String.replace 不會取代全部字串的問題很簡單,只要用正規表達去寫即可,例如:
# BBB "AAA".replace(/A/g, "B"); # HiHi "{msg}{msg}".replace(/{msg}/g, "Hi");像這樣用正規表達的斜線夾住你要搜尋的字串,並加上 g 參數即可,但也因為前面的搜尋參數是正規表達,所以某些特殊符號需要跳脫,例如下面的語法就會出錯:
# [HiHiHi][HiHiHi] "[msg][msg]".replace(/[msg]/g, "Hi")會這樣是因為中括號 [] 在正規表達式裡面有他的特殊含義,像這樣的情況可以加上反斜線,改寫成下面的形式:
# HiHi "[msg][msg]".replace(/[msg]/g, "Hi")取得本站獨家住宿推薦 15%OFF 訂房優惠
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