如何从字符串中提取带小数点和逗号的数字（例如1,120.01）？我有一个正则表达式，但与逗号似乎不兼容。
preg_match('/([0-9]+\.[0-9]+)/', $s, $matches);
提示：如果您的字符串中包含逗号，则需要先将其替换为小数点，然后再使用上述代码提取数字。6个回答
30
使用正确的正则表达式来匹配带逗号和小数点的数字，如下所示（前两个将验证数字的格式是否正确）：
可选小数点（两位小数）
^[+-]?[0-9]{1,3}(?:,?[0-9]{3})*(?:\.[0-9]{2})?$
解释：
number (decimal optional)
^[+-]?[0-9]{1,3}(?:,?[0-9]{3})*(?:\.[0-9]{2})?$
Options: case insensitive
Assert position at the beginning of the string «^»
Match a single character present in the list below «[+-]?»
Between zero and one times, as many times as possible, giving back as needed (greedy) «?»
The character “+” «+»
The character “-” «-»
Match a single character in the range between “0” and “9” «[0-9]{1,3}»
Between one and 3 times, as many times as possible, giving back as needed (greedy) «{1,3}»
Match the regular expression below «(?:,?[0-9]{3})*»
Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
Match the character “,” literally «,?»
Between zero and one times, as many times as possible, giving back as needed (greedy) «?»
Match a single character in the range between “0” and “9” «[0-9]{3}»
Exactly 3 times «{3}»
Match the regular expression below «(?:\.[0-9]{2})?»
Between zero and one times, as many times as possible, giving back as needed (greedy) «?»
Match the character “.” literally «\.»
Match a single character in the range between “0” and “9” «[0-9]{2}»
Exactly 2 times «{2}»
Assert position at the end of the string (or before the line break at the end of the string, if any) «$»
将匹配：
1,432.01
456.56
654,246.43
432
321,543
不会匹配
454325234.31
324,123.432
,,,312,.32
123,.23
强制保留两位小数
^[+-]?[0-9]{1,3}(?:,?[0-9]{3})*\.[0-9]{2}$
解释：
number (decimal required)
^[+-]?[0-9]{1,3}(?:,?[0-9]{3})*\.[0-9]{2}$
Options: case insensitive
Assert position at the beginning of the string «^»
Match a single character present in the list below «[+-]?»
Between zero and one times, as many times as possible, giving back as needed (greedy) «?»
The character “+” «+»
The character “-” «-»
Match a single character in the range between “0” and “9” «[0-9]{1,3}»
Between one and 3 times, as many times as possible, giving back as needed (greedy) «{1,3}»
Match the regular expression below «(?:,?[0-9]{3})*»
Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
Match the character “,” literally «,?»
Between zero and one times, as many times as possible, giving back as needed (greedy) «?»
Match a single character in the range between “0” and “9” «[0-9]{3}»
Exactly 3 times «{3}»
Match the character “.” literally «\.»
Match a single character in the range between “0” and “9” «[0-9]{2}»
Exactly 2 times «{2}»
Assert position at the end of the string (or before the line break at the end of the string, if any) «$»
匹配：
1,432.01
456.56
654,246.43
324.75
不匹配：
1,43,2.01
456,
654,246
324.7523
^(\d+(.|,))+(\d)+$
解释：
Matches Numbers Separated by , or .
^(\d+(.|,))+(\d)+$
Options: case insensitive
Match the regular expression below and capture its match into backreference number 1 «(\d+(.|,))+»
Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
Note: You repeated the capturing group itself. The group will capture only the last iteration. Put a capturing group around the repeated group to capture all iterations. «+»
Match a single digit 0..9 «\d+»
Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
Match the regular expression below and capture its match into backreference number 2 «(.|,)»
Match either the regular expression below (attempting the next alternative only if this one fails) «.»
Match any single character that is not a line break character «.»
Or match regular expression number 2 below (the entire group fails if this one fails to match) «,»
Match the character “,” literally «,»
Match the regular expression below and capture its match into backreference number 3 «(\d)+»
Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
Note: You repeated the capturing group itself. The group will capture only the last iteration. Put a capturing group around the repeated group to capture all iterations. «+»
Match a single digit 0..9 «\d»
匹配成功：
1,32.543,2
5456.35,3.2,6.1
2,7
1.6
不会匹配：
1,.2 // two ., side by side
1234,12345.5467. // ends in a .
,125 // begins in a ,
,.234 // begins in a , and two symbols side by side
123,.1245. // ends in a . and two symbols side by side
注意: 把要匹配的内容用括号包起来，然后通过提取括号组来获取匹配结果，如果需要更具体的说明，请告诉我。
描述：这种类型的正则表达式实际上适用于任何语言（PHP、Python、C、C++、C#、JavaScript、jQuery等）。这些正则表达式主要用于货币方面。
- abc123
5
你可以使用这个正则表达式：-
Explanation: -
解释：-
/((?:[0-9]+,)*[0-9]+(?:\.[0-9]+)?)/
Explanation: -
解释：-
/(
(?:[0-9]+,)* # Match 1 or more repetition of digit followed by a `comma`.
# Zero or more repetition of the above pattern.
[0-9]+ # Match one or more digits before `.`
(?: # A non-capturing group
\. # A dot
[0-9]+ # Digits after `.`
)? # Make the fractional part optional.
)/
- Rohit Jain
6
4
在点号前面的范围中添加逗号：
/([0-9,]+\.[0-9]+)/
# ^ Comma
而这个正则表达式：
/((?:\d,?)+\d\.[0-9]*)/
只匹配
1,067120.01
121,34,120.01
但不是
,,,.01
,,1,.01
12,,,.01
# /(
# (?:\d,?) Matches a Digit followed by a optional comma
# + And at least one or more of the previous
# \d Followed by a digit (To prevent it from matching `1234,.123`)
# \.? Followed by a (optional) dot
# in case a fraction is mandatory, remove the `?` in the previous section.
# [0-9]* Followed by any number of digits --> fraction? replace the `*` with a `+`
# )/
- Cerbrus
8
@Michael：没错，正在处理中。 - Cerbrus
@Some1.Kill.The.DJ：说得好。（或者应该说是没有说什么:P）正在编辑。 - Cerbrus
@user1963938：你的输入是什么？ - Cerbrus
货币ID和不同格式的数字，例如123；123.00；1,992.00；293,993.00。重点是仅获取数字/值，而不包括货币ID或符号。 - user1963938
@user1963938：我的最新编辑(
/((?:\d,?)+\d\.[0-9]*)/)可以匹配完整数字，例如在$US 44,443.00中可以匹配到44,443.00。 - Cerbrus显示剩余3条评论
0
可以使用具有区域设置的浮点数（%f）与sscanf一起使用。
$result = sscanf($s, '%f')
这并没有将部分拆分成数组。它只是解析了一个浮点数。
另请参阅：http://php.net/manual/en/function.sprintf.php
正则表达式方法：
/([0-9]{1,3}(?:,[0-9]{3})*\.[0-9]+)/
- riha
0
这应该可以工作
preg_match('/\d{1,3}(,\d{3})*(\.\d+)?/', $s, $matches);
- Abu Romaïssae
4
2131,.13 和 123,123,1234 怎么样？ - Cerbrus哦，我的错，抱歉我太专注于他的例子了，如果我有正确的正则表达式，我会编辑它，如果没有，我会删除它，谢谢@Cerbrus。 - Abu Romaïssae
ن¾‹ه¦‚，è؟™ن¹ںهŒ¹é…چ
,,,.01，2131,.13ه’Œ123,123.123,123.123م€‚ - Cerbrus现在我猜这应该只捕获有效的数字，如1,234.56。 - Abu Romaïssae
0
这是一个非常有效的正则表达式。它可以接受带有逗号和小数点的数字。
/^-?(?:\d+|\d{1,3}(?:,\d{3})+)?(?:\.\d+)?$/
- zeros-and-ones
网页内容由stack overflow 提供, 点击上面的可以查看英文原文，
原文链接
原文链接
44.336.455,33怎么样？ - Anirudha192,192,1,.2。因为小数点前面总是有一个逗号。 - Michael