[英]Regex to allow one or two digits followed by commas (spaces are allowed too)
I'm trying to implement the regex described on the title...here's what i have so far: 我正在尝试实现标题中描述的正则表达式...这是我到目前为止的内容:
"(^\\d{1,2})+(,\\d{1,2})*$"
It works when my input is like this: 当我的输入是这样时,它可以工作:
1,2,3,4,5,6,7 and so goes on
But i'd like to allow the user to add white spaces as he/she wants: 但我想允许用户根据需要添加空格:
1 , 2,3,4 ,5
I know it's a bit weird but it's a flexibility i'd like to give to the final user. 我知道这有点奇怪,但是我想给最终用户一个灵活性。 How can i acomplish this?
我该如何完成呢?
EDIT: I forgot to mention that the spaces are only allowed before or after the one or two digits; 编辑:我忘了提到空格只允许在一位或两位数之前或之后;
EDIT2: I also forgot to mention that after the comma, can have white spaces too. EDIT2:我也忘记提及逗号后,也可以有空格。
I would add optional whitespace in a positive lookahead, as such: 我会在正向前瞻中添加可选的空格,例如:
String input = "1, 2 , 3, 45 , 67,89";
// | 1 or 2 digits
// | | start positive lookahead
// | | | optional whitespace
// | | | | comma
// | | | || or
// | | | ||| end of input
Pattern p = Pattern.compile("\\d{1,2}(?=\\s*,|$)");
Matcher m = p.matcher(input);
while (m.find()) {
System.out.println(m.group());
}
Output 输出量
1
2
3
45
67
89
Replace your ', ' with [, ]+ 将您的','替换为[,] +
eg 例如
[0-9]+([ ,]+[0-9]+)*
使用: \\\\d{1,2}(?=\\\\s*,*)
。这将匹配您的字符串
我认为这是一种可行的详细方法:
"(\\\\d{1,2}\\\\s*,\\\\s*)*"
As you know 如你所知
^(\\d{1,2})+(,\\d{1,2})*$
works for 效劳于
1,2,3,4,5,6,7
If you want to let ,
be surrounded by zero or more spaces you can write it as \\\\s*,\\\\s*
. 如果您想让
,
零个或多个空格所包围,您可以把它写成\\\\s*,\\\\s*
。 So to let regex match something like 所以让正则表达式匹配类似
1 , 2,3,4 ,5
all you need to do is change 您需要做的就是改变
^(\\d{1,2})+(,\\d{1,2})*$
to 至
^(\\d{1,2})+(\\s*,\\s*\\d{1,2})*$
// ^^^^^^^^^ - part changed
If you would also like to add spaces before and after your entire input also surround your regex with \\\\s*
like 如果您还想在整个输入之前和之后添加空格,也可以使用
\\\\s*
将正则表达式括起来,例如
^\\s*(\\d{1,2})+(\\s*,\\s*\\d{1,2})*\\s*$
Firstly, I would change 首先,我会改变
"(^\\d{1,2})+(,\\d{1,2})*$"
to 至
"^\\d{1,2}(,\\d{1,2})*$"
as that first bracket group won't be repeated, and then throw in a bunch of spaces: 因为第一个括号组将不会重复,然后会抛出一堆空格:
"^\\s*\\d{1,2}\\s*(,\\s*\\d{1,2}\\s*)*$"
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