正则表达式匹配逗号分隔的数字具有可选的小数部分 [英] RegEx to match comma separated numbers with optional decimal part
问题描述
我有一个正则表达式匹配逗号分隔的数字,在一个给定的多行文本可选两位小数部分。
I've a regex that matches comma separated numbers with an optional two digit decimal part in a given multiline text.
/(?<=\s|^)\d{1,3}(,\d{3})*(\.\d{2})?(?=\s|$)/m
它匹配像1,12,12.34,成功12,345.67等字符串。如何修改它的一些搭配只喜欢 0.23
?
编辑:只是为了澄清 - 我想修改的正则表达式,使其符合 12
, 12.34
和 0.34
Just to clarify - I would like to modify the regex so that it matches 12
, 12.34
and .34
和我期待的'独立'的有效数字。即,数字串,其边界要么是空白或启动/行/字符串的结尾。
And I am looking for 'stand alone' valid numbers. i.e., number-strings whose boundaries are either white space or start/end of line/string.
推荐答案
本:
\d{1,3}(,\d{3})*(\.\d\d)?|\.\d\d
符合以下所有的数字:
matches all of the following numbers:
1
12
.99
12.34
12,345.67
999,999,999,999,999.99
如果你想为排除如 123A
号码(街道地址为例),或 123.123
(数字超过2小数点后的数字),请尝试:
If you want to exclude numbers like 123a
(street addresses for example), or 123.123
(numbers with more than 2 digits after the decimal point), try:
(?<=\s|^)(\d{1,3}(,\d{3})*(\.\d\d)?|\.\d\d)(?=\s|$)
一个小的演示(我猜你正在使用PHP):
A little demo (I guessed you're using PHP):
$text = "666a 1 fd 12 dfsa .99 fds 12.34 dfs 12,345.67 er 666.666 er 999,999,999,999,999.99";
$number_regex = "/(?<=\s|^)(?:\d{1,3}(?:,\d{3})*(?:\.\d\d)?|\.\d\d)(?=\s|$)/";
if(preg_match_all($number_regex, $text, $matches)) {
print_r($matches);
}
这将输出:
Array
(
[0] => Array
(
[0] => 1
[1] => 12
[2] => .99
[3] => 12.34
[4] => 12,345.67
[5] => 999,999,999,999,999.99
)
)
请注意,它忽略了字符串 666A
和 666.666
Note that it ignores the strings 666a
and 666.666
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