如何从字符串（例如 1,120.01）中提取带小数点（点和逗号）的数字？我有一个正则表达式，但似乎不能很好地使用逗号
preg_match('/([0-9]+\.[0-9]+)/', $s, $matches);
问问题
19872 次
6 回答
29
用逗号和小数匹配数字的正确正则表达式如下（前两个将验证数字的格式是否正确）：
小数可选（两位小数）
^[+-]?[0-9]{1,3}(?:,?[0-9]{3})*(?:\.[0-9]{2})?$
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) «$»
将匹配：
1,432.01
456.56
654,246.43
432
321,543
不匹配
454325234.31
324,123.432
,,,312,.32
123,.23
必须小数（两位小数）
^[+-]?[0-9]{1,3}(?:,?[0-9]{3})*\.[0-9]{2}$
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) «$»
将匹配：
1,432.01
456.56
654,246.43
324.75
不匹配：
1,43,2.01
456,
654,246
324.7523
不加选择地匹配以逗号或小数分隔的数字：
^(\d+(.|,))+(\d)+$
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»
将匹配：
1,32.543,2
5456.35,3.2,6.1
2,7
1.6
不匹配：
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：包装在一个组中，然后拉组，如果您需要更多细节，请告诉我。
描述：这种类型的 RegEx 真正适用于任何语言（PHP、Python、C、C++、C#、JavaScript、jQuery 等）。这些正则表达式主要适用于货币。
于 2013-01-23T14:47:01.950 回答
4
你可以使用这个正则表达式： -
/((?:[0-9]+,)*[0-9]+(?:\.[0-9]+)?)/
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.
)/
于 2013-01-23T14:29:00.517 回答
3
将逗号添加到可以在点前面的范围内：
/([0-9,]+\.[0-9]+)/
# ^ Comma
而这个正则表达式：
/((?:\d,?)+\d\.[0-9]*)/
只会匹配
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 `+`
# )/
于 2013-01-23T14:27:08.580 回答
0
这应该工作
preg_match('/\d{1,3}(,\d{3})*(\.\d+)?/', $s, $matches);
于 2013-01-23T14:45:52.303 回答
0
可识别区域设置的浮点数 (%f) 可能与 sscanf 一起使用。
$result = sscanf($s, '%f')
不过，这并没有将这些部分拆分成一个数组。它只是解析一个浮点数。
另见： http: //php.net/manual/en/function.sprintf.php
正则表达式方法：
/([0-9]{1,3}(?:,[0-9]{3})*\.[0-9]+)/
于 2013-01-23T14:32:57.450 回答
0
这是一个很棒的工作正则表达式。这接受带有逗号和小数的数字。
/^-?(?:\d+|\d{1,3}(?:,\d{3})+)?(?:\.\d+)?$/
于 2014-08-04T18:23:05.963 回答