php - regex - 如何从字符串中提取带小数(点和逗号)的数字(例如1,120.01)？

Question

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,但似乎不能用逗号

preg_match('/([0-9]+\.[0-9]+)/', $s, $matches);

Answer 1

使用逗号和小数匹配数字的正确正则表达式如下(前两个将验证数字格式是否正确):

十进制可选(小数点后两位)

^[+-]?[0-9]{1,3}(?:,?[0-9]{3})*(?:\.[0-9]{2})?$

Debuggex演示

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

十进制强制(小数点后两位)

^[+-]?[0-9]{1,3}(?:,?[0-9]{3})*\.[0-9]{2}$

Debuggex演示

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

匹配不加选择地用逗号或小数分隔的数字:

^(\d+(.|,))+(\d)+$

Debuggex演示

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:在一个组中包装,然后只需拉出组,如果您需要更多细节,请告诉我.

描述:这种类型的RegEx可以使用任何语言(PHP,Python,C,C++,C#,JavaScript,jQuery等).这些正则表达式主要适用于货币.

Answer 2

您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.
 )/

Answer 3

将逗号添加到可以在点前面的范围：

/([0-9,]+\.[0-9]+)/
#     ^ Comma

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 `+`
# )/