[英]Splitting string into array of words using Regular Expressions
I'm trying to split a string into an array of words, however I want to keep the spaces after each word. 我正在尝试将一个字符串拆分成一个单词数组,但是我想在每个单词后面保留空格。 Here's what I'm trying: 这是我正在尝试的:
var re = /[a-z]+[$\s+]/gi;
var test = "test one two three four ";
var results = test.match(re);
The results I expect are: 我期望的结果是:
[0]: "test "
[1]: "one "
[2]: "two "
[3]: "three "
[4]: "four "
However, it only matches up to one space after each word: 但是,每个单词后最多只匹配一个空格:
[0]: "test "
[1]: "one "
[2]: "two "
[3]: "three "
[4]: "four "
What am I doing wrong? 我究竟做错了什么?
Consider: 考虑:
var results = test.match(/\S+\s*/g);
That would guarantee you don't miss any characters (besides a few spaces at the beginnings, but \\S*\\s*
can take care of that) 这样可以保证你不会错过任何字符(除了开头的几个空格,但\\S*\\s*
可以处理)
Your original regex reads: 你原来的正则表达式是:
[az]+
- match any number of letters (at least one) [az]+
- 匹配任意数量的字母(至少一个) [$\\s+]
- much a single character - $
, +
or whitespace. [$\\s+]
- 多个字符 - $
, +
或空格。 With no quantifier after this group, you only match a single space. 在此组之后没有量词,您只匹配一个空格。 请尝试以下方法:
test.match(/\w+\s+/g); // \w = words, \s = white spaces
You are using +
inside the char class. 你在char类中使用+
。 Try using *
outside the char class instead. 尝试在char类之外使用*
。
/[a-z]+\s*/gi;
+
inside the char class is treated as a literal +
and not as a meta char. char类中的+
被视为文字+
而不是元字符。 Using *
will capture zero or more spaces that might follow any word. 使用*
将捕获零个或多个可能跟随任何单词的空格。
The +
is taken literally inside the character class. +
字面意思在字符类中。 You have to move it outside: [\\s]+
or just \\s+
( $
has no meaning inside the class either). 你必须将它移到外面: [\\s]+
或只是\\s+
( $
在类中没有意义)。
The essential bit of your RegEx that needs changing is the part matching the whitespace or end-of-line. 您需要更改的RegEx的基本位是与空白或行尾匹配的部分。
Try: 尝试:
var re = /[a-z]+($|\s+)/gi
or, for non-capturing groups (I don't know if you need this with the /g
flag): 或者,对于非捕获组 (我不知道你是否需要使用/g
标志):
var re = /[a-z]+(?:$|\s+)/gi
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