String:
Ventilator Set:\n FiO2 ≤ 40%\nDrug use:\n NO\nWeaning trials:\n NO\nStop reason:\n neurologic factors\n備註:\n
Purpose
Find the second \n and replace it with another character
Solution
1 2 3 |
var pattern = /\\n(.*?(?:\\n|$))/gm; var sub = '$1<br/>'; read = read.replace(pattern, sub); |
https://regex101.com/r/t9gozM/1
Pattern Explanation: 在\n後面找一個最近的\n或是結尾之間的字串
Notes:
- (?:)
括號裡面的內容不產生指標($1之類的) - ^
一行的開始 - $
一行的結束 - (?=p)
正前向聲明,要求接下來的字元都與樣式p相符,但是不包括比對中的那些字元 - (?!p)
反前向聲明,要求接下來的字元不與樣式p相符
12345678910Route::get('/{category}/{cat_lv3}', 'ProductC@productsByCategory')->where('cat_lv3', '^(?!\d+\-).+');/*/products/pumps/floor-pumpsmatch/products/floor-pumps/1322-JOEBLOW®-BOOSTERNot match*/ - 重複字元(如*)後加上? – 非貪婪的重複比對
/a+/
/a+?/ -> 只符合一個以上的字母a
Reference:
- Completed Usages
https://developer.mozilla.org/zh-TW/docs/Web/JavaScript/Guide/Regular_Expressions - Online Test
https://regex101.com/r/FU2s1H/1