[英]How to split a string by length using split function and a RegEx in javascript?
[英]How to Split string In javascript Using regex
我正在嘗試做這樣的事情
function findLongestWord(str) {
var wordContainer = str.split(/\b/) || 0;
document.write(wordContainer);
}
findLongestWord("The quick brown fox jumped over the lazy dog");
但這又回來了
The, ,quick, ,brown, ,fox, ,jumped, ,over, ,the, ,lazy, ,dog
但是如果我做這樣的事情
function findLongestWord(str) {
var wordContainer = str.split(" ") || 0;
document.write(wordContainer);
}
findLongestWord("The quick brown fox jumped over the lazy dog");
它按預期工作並返回
The,quick,brown,fox,jumped,over,the,lazy,dog
那么為什么在分割中使用/ \\ b /與使用“”不同?
因為" "
是文字空間, \\b
是單詞邊界。
如果第一個字符是單詞字符,則單詞邊界出現在字符串的第一個字符之前;如果最后一個字符是單詞字符,則在字符串的最后一個字符之后,再出現在字符串的兩個字符之間,一個是單詞字符,另一個不是單詞字符,這意味着您的字符串看起來像這樣,帶有邊界:
"The\b \bquick\b \bbrown\b \bfox\b \bjumped\b \bover\b \bthe\b \blazy\b \bdog"
換句話說,您要在單詞的開頭和結尾匹配\\b
,並且在拆分時也得到空格,最后得到
["The"," ","quick"," ","brown"," ","fox"," ","jumped"," ","over"," ","the"," ","lazy"," ","dog"]
如果要在邊界上分割單詞,則必須同時添加它們和中間的任何內容,例如/\\b.\\b/
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