我正在尝试查找并替换文本正文中的所有数字。我找到了一些示例正则表达式,几乎解决了问题,但没有一个是完美的。我遇到的问题是我的文本中的数字可能有也可能没有小数和逗号。例如:
“5000磅的狐狸跳过99,999.99998713英尺的围栏。”
正则表达式应该返回“5000
”和“99,999.99998713
”。示例我发现分解逗号上的数字或限制为两位小数。我开始理解正则表达式足以看出为什么有些例子限于两个小数位,但我还没有学会如何克服它并且还包括逗号以获得整个序列。
这是我的最新版本:
[0-9]+(\.[0-9][0-9]?)?
对于上述文本,返回“5000
”,“99,99
”,“9.99
”和“998713
”。
#ALL THESE REQUIRE THE WHOLE STRING TO BE A NUMBER
#For numbers embedded in sentences, see discussion below
#### NUMBERS AND DECIMALS ONLY ####
#No commas allowed
#Pass: (1000.0), (001), (.001)
#Fail: (1,000.0)
^\d*\.?\d+$
#No commas allowed
#Can't start with "."
#Pass: (0.01)
#Fail: (.01)
^(\d+\.)?\d+$
#### CURRENCY ####
#No commas allowed
#"$" optional
#Can't start with "."
#Either 0 or 2 decimal digits
#Pass: ($1000), (1.00), ($0.11)
#Fail: ($1.0), (1.), ($1.000), ($.11)
^\$?\d+(\.\d{2})?$
#### COMMA-GROUPED ####
#Commas required between powers of 1,000
#Can't start with "."
#Pass: (1,000,000), (0.001)
#Fail: (1000000), (1,00,00,00), (.001)
^\d{1,3}(,\d{3})*(\.\d+)?$
#Commas required
#Cannot be empty
#Pass: (1,000.100), (.001)
#Fail: (1000), ()
^(?=.)(\d{1,3}(,\d{3})*)?(\.\d+)?$
#Commas optional as long as they're consistent
#Can't start with "."
#Pass: (1,000,000), (1000000)
#Fail: (10000,000), (1,00,00)
^(\d+|\d{1,3}(,\d{3})*)(\.\d+)?$
#### LEADING AND TRAILING ZEROES ####
#No commas allowed
#Can't start with "."
#No leading zeroes in integer part
#Pass: (1.00), (0.00)
#Fail: (001)
^([1-9]\d*|0)(\.\d+)?$
#No commas allowed
#Can't start with "."
#No trailing zeroes in decimal part
#Pass: (1), (0.1)
#Fail: (1.00), (0.1000)
^\d+(\.\d*[1-9])?$
现在已经不再这样了,以下大部分内容都是对复杂正则表达式如果能够巧妙地使用它以及为什么要寻找替代方案的评论。阅读风险自负。
这是一项非常常见的任务,但到目前为止我在这里看到的所有答案都会接受与您的数字格式不匹配的输入,例如,111
,9,9,9
甚至.,,.
。即使数字嵌入在其他文本中,这也很容易修复。恕我直言,任何未能拉1,234.56和1234-只有那些数字 - abc22 1,234.56 9.9.9.9 def 1234
是错误的答案。
首先,如果您不需要在一个正则表达式中执行此操作,请不要这样做。即使它们未嵌入到其他文本中,也难以维护两种不同数字格式的单个正则表达式。你应该做的是将整个事物分成空白,然后在结果上运行两到三个较小的正则表达式。如果这不适合您,请继续阅读。
考虑到你给出的例子,这里有一个简单的正则表达式,允许0000
格式中的几乎任何整数或小数,并阻止其他所有内容:
^\d*\.?\d+$
这是一个需要0,000
格式:
^\d{1,3}(,\d{3})*(\.\d+)?$
把它们放在一起,只要它们是一致的,逗号就变成可选的:
^(\d*\.?\d+|\d{1,3}(,\d{3})*(\.\d+)?)$
上述模式要求整个输入为数字。您正在寻找嵌入文本中的数字,因此您必须放松该部分。另一方面,你不希望它看到catch22
并认为它找到了数字22.如果你正在使用具有lookbehind支持的东西(如.NET),这很容易:用^
替换(?<!\S)
和用$
替换(?!\S)
而且你很高兴去:
(?<!\S)(\d*\.?\d+|\d{1,3}(,\d{3})*(\.\d+)?)(?!\S)
如果您正在使用JavaScript或Ruby或其他东西,事情开始变得更复杂:
(?:^|\s)(\d*\.?\d+|\d{1,3}(?:,\d{3})*(?:\.\d+)?)(?!\S)
你必须使用捕获组;没有外观支持,我想不出另类。您想要的数字将在第1组(假设整个匹配为第0组)。
我认为这涵盖了你的问题,所以如果这就是你所需要的,请立即停止阅读。如果你想变得更有魅力,事情会变得非常复杂。根据您的具体情况,您可能希望阻止以下任何或所有情况:
只是为了它的地狱,让我们假设您要阻止前3个,但允许最后一个。你该怎么办?我会告诉你应该做什么,你应该为每个规则使用不同的正则表达式,并逐步缩小你的匹配范围。但是为了挑战,这里是你如何在一个巨大的模式中做到这一切:
(?<!\S)(?=.)(0|([1-9](\d*|\d{0,2}(,\d{3})*)))?(\.\d*[1-9])?(?!\S)
这就是它的含义:
(?<!\S) to (?!\S) #The whole match must be surrounded by either whitespace or line boundaries. So if you see something bogus like :;:9.:, ignore the 9.
(?=.) #The whole thing can't be blank.
( #Rules for the integer part:
0 #1. The integer part could just be 0...
| #
[1-9] # ...otherwise, it can't have leading zeroes.
( #
\d* #2. It could use no commas at all...
| #
\d{0,2}(,\d{3})* # ...or it could be comma-separated groups of 3 digits each.
) #
)? #3. Or there could be no integer part at all.
( #Rules for the decimal part:
\. #1. It must start with a decimal point...
\d* #2. ...followed by a string of numeric digits only.
[1-9] #3. It can't be just the decimal point, and it can't end in 0.
)? #4. The whole decimal part is also optional. Remember, we checked at the beginning to make sure the whole thing wasn't blank.
在这里测试:http://rextester.com/YPG96786
这将允许以下内容:
100,000
999.999
90.0009
1,000,023.999
0.111
.111
0
它会阻止像:
1,1,1.111
000,001.111
999.
0.
111.110000
1.1.1.111
9.909,888
有几种方法可以使这个正则表达式更简单,更短,但要明白,更改模式会放松它认为的数字。
由于许多正则表达式引擎(例如JavaScript和Ruby)不支持负面的lookbehind,因此正确执行此操作的唯一方法是使用捕获组:
(:?^|\s)(?=.)((?:0|(?:[1-9](?:\d*|\d{0,2}(?:,\d{3})*)))?(?:\.\d*[1-9])?)(?!\S)
您正在寻找的数字将在捕获组1中。
在这里测试:http://rubular.com/r/3HCSkndzhT
显然,这是一个庞大,复杂,难以理解的正则表达式。我很享受这个挑战,但您应该考虑是否真的想在生产环境中使用它。你可以用两个方法来完成所有事情:一个正则表达式可以捕获任何可能是数字的东西,然后另一个可以清除任何不是数字的东西。或者您可以进行一些基本处理,然后使用您的语言的内置数字解析功能。你的选择。
(,*[\d]+,*[\d]*)+
这将匹配任何小数或大数,如下有或没有逗号
1
100
1,262
1,56,262
10,78,999
12,34,56,789
要么
1
100
1262
156262
1078999
123456789
几天前,我在the problem of removing trailing zeros from the string of a number工作。
在这个问题的连续性中,我发现这个问题很有意思,因为它将问题扩展到包含逗号的数字。
我已经采用了我在上一个问题中编写的正则表达式模式,并对其进行了改进,以便它可以用逗号处理数字作为此问题的答案。
我的热情和对正则表达的喜爱让我感到震惊。我不知道结果是否完全符合Michael Prescott表达的需要。我有兴趣知道我的正则表达式中过多或缺乏的要点,并纠正它以使其更适合您。
现在,在对这个正则表达式进行了长时间的研究之后,我在大脑中有一种重量,所以我不够新鲜,不能给出很多解释。如果积分不明确,如果有人对此感兴趣,请问我。
构建正则表达式是为了能够检测用科学计数法2E10或甚至5,22,454.12E-00.0478表示的数字,同时删除这些数字的两部分中不必要的零。如果指数等于零,则修改数字,以便不再有指数。
我在模式中加入了一些验证,以便某些特定情况不匹配,例如'12 ..57'将不匹配。但是在',111'中,字符串'111'匹配,因为前面的逗号被认为是逗号不在数字中而是在逗号中。
我认为应该改进逗号的管理,因为在我看来,印度编号中的逗号之间只有2位数。我认为,纠正并不是很难
以下是演示我的正则表达式如何工作的代码。有两种功能,如果有人想要将数字'.1245'转换为'0.1245'或不转换。如果某些数字字符串的错误或不需要的匹配或不匹配仍然存在,我不会感到惊讶;那么我想知道这些案例,以了解和纠正这些不足。
我为这个用Python编写的代码道歉,但正则表达式是跨语言的,我认为每个人都有能力取消reex的模式
import re
regx = re.compile('(?<![\d.])(?!\.\.)(?<![\d.][eE][+-])(?<![\d.][eE])(?<!\d[.,])'
'' #---------------------------------
'([+-]?)'
'(?![\d,]*?\.[\d,]*?\.[\d,]*?)'
'(?:0|,(?=0)|(?<!\d),)*'
'(?:'
'((?:\d(?!\.[1-9])|,(?=\d))+)[.,]?'
'|\.(0)'
'|((?<!\.)\.\d+?)'
'|([\d,]+\.\d+?))'
'0*'
'' #---------------------------------
'(?:'
'([eE][+-]?)(?:0|,(?=0))*'
'(?:'
'(?!0+(?=\D|\Z))((?:\d(?!\.[1-9])|,(?=\d))+)[.,]?'
'|((?<!\.)\.(?!0+(?=\D|\Z))\d+?)'
'|([\d,]+\.(?!0+(?=\D|\Z))\d+?))'
'0*'
')?'
'' #---------------------------------
'(?![.,]?\d)')
def dzs_numbs(x,regx = regx): # ds = detect and zeros-shave
if not regx.findall(x):
yield ('No match,', 'No catched string,', 'No groups.')
for mat in regx.finditer(x):
yield (mat.group(), ''.join(mat.groups('')), mat.groups(''))
def dzs_numbs2(x,regx = regx): # ds = detect and zeros-shave
if not regx.findall(x):
yield ('No match,', 'No catched string,', 'No groups.')
for mat in regx.finditer(x):
yield (mat.group(),
''.join(('0' if n.startswith('.') else '')+n for n in mat.groups('')),
mat.groups(''))
NS = [' 23456000and23456000. or23456000.000 00023456000 s000023456000. 000023456000.000 ',
'arf 10000 sea10000.+10000.000 00010000-00010000. kant00010000.000 ',
' 24: 24, 24. 24.000 24.000, 00024r 00024. blue 00024.000 ',
' 8zoom8. 8.000 0008 0008. and0008.000 ',
' 0 00000M0. = 000. 0.0 0.000 000.0 000.000 .000000 .0 ',
' .0000023456 .0000023456000 '
' .0005872 .0005872000 .00503 .00503000 ',
' .068 .0680000 .8 .8000 .123456123456 .123456123456000 ',
' .657 .657000 .45 .4500000 .7 .70000 0.0000023230000 000.0000023230000 ',
' 0.0081000 0000.0081000 0.059000 0000.059000 ',
' 0.78987400000 snow 00000.78987400000 0.4400000 00000.4400000 ',
' -0.5000 -0000.5000 0.90 000.90 0.7 000.7 ',
' 2.6 00002.6 00002.60000 4.71 0004.71 0004.7100 ',
' 23.49 00023.49 00023.490000 103.45 0000103.45 0000103.45000 ',
' 10003.45067 000010003.45067 000010003.4506700 ',
' +15000.0012 +000015000.0012 +000015000.0012000 ',
' 78000.89 000078000.89 000078000.89000 ',
' .0457e10 .0457000e10 00000.0457000e10 ',
' 258e8 2580000e4 0000000002580000e4 ',
' 0.782e10 0000.782e10 0000.7820000e10 ',
' 1.23E2 0001.23E2 0001.2300000E2 ',
' 432e-102 0000432e-102 004320000e-106 ',
' 1.46e10and0001.46e10 0001.4600000e10 ',
' 1.077e-300 0001.077e-300 0001.077000e-300 ',
' 1.069e10 0001.069e10 0001.069000e10 ',
' 105040.03e10 000105040.03e10 105040.0300e10 ',
' +286E000024.487900 -78.4500e.14500 .0140E789. ',
' 081,12.40E07,95.0120 0045,78,123.03500e-0.00 ',
' 0096,78,473.0380e-0. 0008,78,373.066000E0. 0004512300.E0000 ',
' ..18000 25..00 36...77 2..8 ',
' 3.8..9 .12500. 12.51.400 ',
' 00099,111.8713000 -0012,45,83,987.26+0.000,099,88,44.or00,00,00.00must',
' 00099,44,and 0000,099,88,44.bom',
'00,000,00.587000 77,98,23,45., this,that ',
' ,111 145.20 +9,9,9 0012800 .,,. 1 100,000 ',
'1,1,1.111 000,001.111 -999. 0. 111.110000 1.1.1.111 9.909,888']
for ch in NS:
print 'string: '+repr(ch)
for strmatch, modified, the_groups in dzs_numbs2(ch):
print strmatch.rjust(20),'',modified,'',the_groups
print
结果
string: ' 23456000and23456000. or23456000.000 00023456000 s000023456000. 000023456000.000 '
23456000 23456000 ('', '23456000', '', '', '', '', '', '', '')
23456000. 23456000 ('', '23456000', '', '', '', '', '', '', '')
23456000.000 23456000 ('', '23456000', '', '', '', '', '', '', '')
00023456000 23456000 ('', '23456000', '', '', '', '', '', '', '')
000023456000. 23456000 ('', '23456000', '', '', '', '', '', '', '')
000023456000.000 23456000 ('', '23456000', '', '', '', '', '', '', '')
string: 'arf 10000 sea10000.+10000.000 00010000-00010000. kant00010000.000 '
10000 10000 ('', '10000', '', '', '', '', '', '', '')
10000. 10000 ('', '10000', '', '', '', '', '', '', '')
10000.000 10000 ('', '10000', '', '', '', '', '', '', '')
00010000 10000 ('', '10000', '', '', '', '', '', '', '')
00010000. 10000 ('', '10000', '', '', '', '', '', '', '')
00010000.000 10000 ('', '10000', '', '', '', '', '', '', '')
string: ' 24: 24, 24. 24.000 24.000, 00024r 00024. blue 00024.000 '
24 24 ('', '24', '', '', '', '', '', '', '')
24, 24 ('', '24', '', '', '', '', '', '', '')
24. 24 ('', '24', '', '', '', '', '', '', '')
24.000 24 ('', '24', '', '', '', '', '', '', '')
24.000 24 ('', '24', '', '', '', '', '', '', '')
00024 24 ('', '24', '', '', '', '', '', '', '')
00024. 24 ('', '24', '', '', '', '', '', '', '')
00024.000 24 ('', '24', '', '', '', '', '', '', '')
string: ' 8zoom8. 8.000 0008 0008. and0008.000 '
8 8 ('', '8', '', '', '', '', '', '', '')
8. 8 ('', '8', '', '', '', '', '', '', '')
8.000 8 ('', '8', '', '', '', '', '', '', '')
0008 8 ('', '8', '', '', '', '', '', '', '')
0008. 8 ('', '8', '', '', '', '', '', '', '')
0008.000 8 ('', '8', '', '', '', '', '', '', '')
string: ' 0 00000M0. = 000. 0.0 0.000 000.0 000.000 .000000 .0 '
0 0 ('', '0', '', '', '', '', '', '', '')
00000 0 ('', '0', '', '', '', '', '', '', '')
0. 0 ('', '0', '', '', '', '', '', '', '')
000. 0 ('', '0', '', '', '', '', '', '', '')
0.0 0 ('', '', '0', '', '', '', '', '', '')
0.000 0 ('', '', '0', '', '', '', '', '', '')
000.0 0 ('', '', '0', '', '', '', '', '', '')
000.000 0 ('', '', '0', '', '', '', '', '', '')
.000000 0 ('', '', '0', '', '', '', '', '', '')
.0 0 ('', '', '0', '', '', '', '', '', '')
string: ' .0000023456 .0000023456000 .0005872 .0005872000 .00503 .00503000 '
.0000023456 0.0000023456 ('', '', '', '.0000023456', '', '', '', '', '')
.0000023456000 0.0000023456 ('', '', '', '.0000023456', '', '', '', '', '')
.0005872 0.0005872 ('', '', '', '.0005872', '', '', '', '', '')
.0005872000 0.0005872 ('', '', '', '.0005872', '', '', '', '', '')
.00503 0.00503 ('', '', '', '.00503', '', '', '', '', '')
.00503000 0.00503 ('', '', '', '.00503', '', '', '', '', '')
string: ' .068 .0680000 .8 .8000 .123456123456 .123456123456000 '
.068 0.068 ('', '', '', '.068', '', '', '', '', '')
.0680000 0.068 ('', '', '', '.068', '', '', '', '', '')
.8 0.8 ('', '', '', '.8', '', '', '', '', '')
.8000 0.8 ('', '', '', '.8', '', '', '', '', '')
.123456123456 0.123456123456 ('', '', '', '.123456123456', '', '', '', '', '')
.123456123456000 0.123456123456 ('', '', '', '.123456123456', '', '', '', '', '')
string: ' .657 .657000 .45 .4500000 .7 .70000 0.0000023230000 000.0000023230000 '
.657 0.657 ('', '', '', '.657', '', '', '', '', '')
.657000 0.657 ('', '', '', '.657', '', '', '', '', '')
.45 0.45 ('', '', '', '.45', '', '', '', '', '')
.4500000 0.45 ('', '', '', '.45', '', '', '', '', '')
.7 0.7 ('', '', '', '.7', '', '', '', '', '')
.70000 0.7 ('', '', '', '.7', '', '', '', '', '')
0.0000023230000 0.000002323 ('', '', '', '.000002323', '', '', '', '', '')
000.0000023230000 0.000002323 ('', '', '', '.000002323', '', '', '', '', '')
string: ' 0.0081000 0000.0081000 0.059000 0000.059000 '
0.0081000 0.0081 ('', '', '', '.0081', '', '', '', '', '')
0000.0081000 0.0081 ('', '', '', '.0081', '', '', '', '', '')
0.059000 0.059 ('', '', '', '.059', '', '', '', '', '')
0000.059000 0.059 ('', '', '', '.059', '', '', '', '', '')
string: ' 0.78987400000 snow 00000.78987400000 0.4400000 00000.4400000 '
0.78987400000 0.789874 ('', '', '', '.789874', '', '', '', '', '')
00000.78987400000 0.789874 ('', '', '', '.789874', '', '', '', '', '')
0.4400000 0.44 ('', '', '', '.44', '', '', '', '', '')
00000.4400000 0.44 ('', '', '', '.44', '', '', '', '', '')
string: ' -0.5000 -0000.5000 0.90 000.90 0.7 000.7 '
-0.5000 -0.5 ('-', '', '', '.5', '', '', '', '', '')
-0000.5000 -0.5 ('-', '', '', '.5', '', '', '', '', '')
0.90 0.9 ('', '', '', '.9', '', '', '', '', '')
000.90 0.9 ('', '', '', '.9', '', '', '', '', '')
0.7 0.7 ('', '', '', '.7', '', '', '', '', '')
000.7 0.7 ('', '', '', '.7', '', '', '', '', '')
string: ' 2.6 00002.6 00002.60000 4.71 0004.71 0004.7100 '
2.6 2.6 ('', '', '', '', '2.6', '', '', '', '')
00002.6 2.6 ('', '', '', '', '2.6', '', '', '', '')
00002.60000 2.6 ('', '', '', '', '2.6', '', '', '', '')
4.71 4.71 ('', '', '', '', '4.71', '', '', '', '')
0004.71 4.71 ('', '', '', '', '4.71', '', '', '', '')
0004.7100 4.71 ('', '', '', '', '4.71', '', '', '', '')
string: ' 23.49 00023.49 00023.490000 103.45 0000103.45 0000103.45000 '
23.49 23.49 ('', '', '', '', '23.49', '', '', '', '')
00023.49 23.49 ('', '', '', '', '23.49', '', '', '', '')
00023.490000 23.49 ('', '', '', '', '23.49', '', '', '', '')
103.45 103.45 ('', '', '', '', '103.45', '', '', '', '')
0000103.45 103.45 ('', '', '', '', '103.45', '', '', '', '')
0000103.45000 103.45 ('', '', '', '', '103.45', '', '', '', '')
string: ' 10003.45067 000010003.45067 000010003.4506700 '
10003.45067 10003.45067 ('', '', '', '', '10003.45067', '', '', '', '')
000010003.45067 10003.45067 ('', '', '', '', '10003.45067', '', '', '', '')
000010003.4506700 10003.45067 ('', '', '', '', '10003.45067', '', '', '', '')
string: ' +15000.0012 +000015000.0012 +000015000.0012000 '
+15000.0012 +15000.0012 ('+', '', '', '', '15000.0012', '', '', '', '')
+000015000.0012 +15000.0012 ('+', '', '', '', '15000.0012', '', '', '', '')
+000015000.0012000 +15000.0012 ('+', '', '', '', '15000.0012', '', '', '', '')
string: ' 78000.89 000078000.89 000078000.89000 '
78000.89 78000.89 ('', '', '', '', '78000.89', '', '', '', '')
000078000.89 78000.89 ('', '', '', '', '78000.89', '', '', '', '')
000078000.89000 78000.89 ('', '', '', '', '78000.89', '', '', '', '')
string: ' .0457e10 .0457000e10 00000.0457000e10 '
.0457e10 0.0457e10 ('', '', '', '.0457', '', 'e', '10', '', '')
.0457000e10 0.0457e10 ('', '', '', '.0457', '', 'e', '10', '', '')
00000.0457000e10 0.0457e10 ('', '', '', '.0457', '', 'e', '10', '', '')
string: ' 258e8 2580000e4 0000000002580000e4 '
258e8 258e8 ('', '258', '', '', '', 'e', '8', '', '')
2580000e4 2580000e4 ('', '2580000', '', '', '', 'e', '4', '', '')
0000000002580000e4 2580000e4 ('', '2580000', '', '', '', 'e', '4', '', '')
string: ' 0.782e10 0000.782e10 0000.7820000e10 '
0.782e10 0.782e10 ('', '', '', '.782', '', 'e', '10', '', '')
0000.782e10 0.782e10 ('', '', '', '.782', '', 'e', '10', '', '')
0000.7820000e10 0.782e10 ('', '', '', '.782', '', 'e', '10', '', '')
string: ' 1.23E2 0001.23E2 0001.2300000E2 '
1.23E2 1.23E2 ('', '', '', '', '1.23', 'E', '2', '', '')
0001.23E2 1.23E2 ('', '', '', '', '1.23', 'E', '2', '', '')
0001.2300000E2 1.23E2 ('', '', '', '', '1.23', 'E', '2', '', '')
string: ' 432e-102 0000432e-102 004320000e-106 '
432e-102 432e-102 ('', '432', '', '', '', 'e-', '102', '', '')
0000432e-102 432e-102 ('', '432', '', '', '', 'e-', '102', '', '')
004320000e-106 4320000e-106 ('', '4320000', '', '', '', 'e-', '106', '', '')
string: ' 1.46e10and0001.46e10 0001.4600000e10 '
1.46e10 1.46e10 ('', '', '', '', '1.46', 'e', '10', '', '')
0001.46e10 1.46e10 ('', '', '', '', '1.46', 'e', '10', '', '')
0001.4600000e10 1.46e10 ('', '', '', '', '1.46', 'e', '10', '', '')
string: ' 1.077e-300 0001.077e-300 0001.077000e-300 '
1.077e-300 1.077e-300 ('', '', '', '', '1.077', 'e-', '300', '', '')
0001.077e-300 1.077e-300 ('', '', '', '', '1.077', 'e-', '300', '', '')
0001.077000e-300 1.077e-300 ('', '', '', '', '1.077', 'e-', '300', '', '')
string: ' 1.069e10 0001.069e10 0001.069000e10 '
1.069e10 1.069e10 ('', '', '', '', '1.069', 'e', '10', '', '')
0001.069e10 1.069e10 ('', '', '', '', '1.069', 'e', '10', '', '')
0001.069000e10 1.069e10 ('', '', '', '', '1.069', 'e', '10', '', '')
string: ' 105040.03e10 000105040.03e10 105040.0300e10 '
105040.03e10 105040.03e10 ('', '', '', '', '105040.03', 'e', '10', '', '')
000105040.03e10 105040.03e10 ('', '', '', '', '105040.03', 'e', '10', '', '')
105040.0300e10 105040.03e10 ('', '', '', '', '105040.03', 'e', '10', '', '')
string: ' +286E000024.487900 -78.4500e.14500 .0140E789. '
+286E000024.487900 +286E24.4879 ('+', '286', '', '', '', 'E', '', '', '24.4879')
-78.4500e.14500 -78.45e0.145 ('-', '', '', '', '78.45', 'e', '', '.145', '')
.0140E789. 0.014E789 ('', '', '', '.014', '', 'E', '789', '', '')
string: ' 081,12.40E07,95.0120 0045,78,123.03500e-0.00 '
081,12.40E07,95.0120 81,12.4E7,95.012 ('', '', '', '', '81,12.4', 'E', '', '', '7,95.012')
0045,78,123.03500 45,78,123.035 ('', '', '', '', '45,78,123.035', '', '', '', '')
string: ' 0096,78,473.0380e-0. 0008,78,373.066000E0. 0004512300.E0000 '
0096,78,473.0380 96,78,473.038 ('', '', '', '', '96,78,473.038', '', '', '', '')
0008,78,373.066000 8,78,373.066 ('', '', '', '', '8,78,373.066', '', '', '', '')
0004512300. 4512300 ('', '4512300', '', '', '', '', '', '', '')
string: ' ..18000 25..00 36...77 2..8 '
No match, No catched string, No groups.
string: ' 3.8..9 .12500. 12.51.400 '
No match, No catched string, No groups.
string: ' 00099,111.8713000 -0012,45,83,987.26+0.000,099,88,44.or00,00,00.00must'
00099,111.8713000 99,111.8713 ('', '', '', '', '99,111.8713', '', '', '', '')
-0012,45,83,987.26 -12,45,83,987.26 ('-', '', '', '', '12,45,83,987.26', '', '', '', '')
00,00,00.00 0 ('', '', '0', '', '', '', '', '', '')
string: ' 00099,44,and 0000,099,88,44.bom'
00099,44, 99,44 ('', '99,44', '', '', '', '', '', '', '')
0000,099,88,44. 99,88,44 ('', '99,88,44', '', '', '', '', '', '', '')
string: '00,000,00.587000 77,98,23,45., this,that '
00,000,00.587000 0.587 ('', '', '', '.587', '', '', '', '', '')
77,98,23,45. 77,98,23,45 ('', '77,98,23,45', '', '', '', '', '', '', '')
string: ' ,111 145.20 +9,9,9 0012800 .,,. 1 100,000 '
,111 111 ('', '111', '', '', '', '', '', '', '')
145.20 145.2 ('', '', '', '', '145.2', '', '', '', '')
+9,9,9 +9,9,9 ('+', '9,9,9', '', '', '', '', '', '', '')
0012800 12800 ('', '12800', '', '', '', '', '', '', '')
1 1 ('', '1', '', '', '', '', '', '', '')
100,000 100,000 ('', '100,000', '', '', '', '', '', '', '')
string: '1,1,1.111 000,001.111 -999. 0. 111.110000 1.1.1.111 9.909,888'
1,1,1.111 1,1,1.111 ('', '', '', '', '1,1,1.111', '', '', '', '')
000,001.111 1.111 ('', '', '', '', '1.111', '', '', '', '')
-999. -999 ('-', '999', '', '', '', '', '', '', '')
0. 0 ('', '0', '', '', '', '', '', '', '')
111.110000 111.11 ('', '', '', '', '111.11', '', '', '', '')
下面的正则表达式将匹配您示例中的两个数字。
\b\d[\d,.]*\b
它将返回5000和99,999.99998713 - 符合您的要求。
你需要一定的自由,你正在寻找
\d+([\d,]?\d)*(\.\d+)?
但请注意这将匹配,例如11,11,1
\d+(,\d+)*(\.\d+)?
这假定在任何逗号或小数之前或之后始终至少有一个数字,并且还假定最多有一个小数,并且所有逗号都在小数之前。
这个正则表达式:
(\d{1,3},\d{3}(,\d{3})*)(\.\d*)?|\d+\.?\d*
匹配字符串中的每个数字:
1 1.0 0.1 1.001 1,000 1,000,000 1000.1 1,000.1 1,323,444,000 1,999 1,222,455,666.0 1,244
这是另一种结构,它以最简单的数字格式开始,然后以非重叠的方式逐步添加更复杂的数字格式:
Java regep:
(\d)|([1-9]\d+)|(\.\d+)|(\d\.\d*)|([1-9]\d+\.\d*)|([1-9]\d{0,2}(,\d{3})+(\.\d*)?)
作为一个Java字符串(注意额外的\需要转义到\和。因为\和。在自己的regexp中有特殊含义):
String myregexp="(\\d)|([1-9]\\d+)|(\\.\\d+)|(\\d\\.\\d*)|([1-9]\\d+\\.\\d*)|([1-9]\\d{0,2}(,\\d{3})+(\\.\\d*)?)";
说明:
如果您有兴趣,请告诉我,我可以根据需要在上面编辑以处理右侧的尾随零。
这是匹配regexp和什么不匹配:
0
1
02 <- invalid
20
22
003 <- invalid
030 <- invalid
300
033 <- invalid
303
330
333
0004 <- invalid
0040 <- invalid
0400 <- invalid
4000
0044 <- invalid
0404 <- invalid
0440 <- invalid
4004
4040
4400
0444 <- invalid
4044
4404
4440
4444
00005 <- invalid
00050 <- invalid
00500 <- invalid
05000 <- invalid
50000
00055 <- invalid
00505 <- invalid
00550 <- invalid
05050 <- invalid
05500 <- invalid
50500
55000
00555 <- invalid
05055 <- invalid
05505 <- invalid
05550 <- invalid
50550
55050
55500
. <- invalid
.. <- invalid
.0
0.
.1
1.
.00
0.0
00. <- invalid
.02
0.2
02. <- invalid
.20
2.0
20.
.22
2.2
22.
.000
0.00
00.0 <- invalid
000. <- invalid
.003
0.03
00.3 <- invalid
003. <- invalid
.030
0.30
03.0 <- invalid
030. <- invalid
.033
0.33
03.3 <- invalid
033. <- invalid
.303
3.03
30.3
303.
.333
3.33
33.3
333.
.0000
0.000
00.00 <- invalid
000.0 <- invalid
0000. <- invalid
.0004
0.0004
00.04 <- invalid
000.4 <- invalid
0004. <- invalid
.0044
0.044
00.44 <- invalid
004.4 <- invalid
0044. <- invalid
.0404
0.404
04.04 <- invalid
040.4 <- invalid
0404. <- invalid
.0444
0.444
04.44 <- invalid
044.4 <- invalid
0444. <- invalid
.4444
4.444
44.44
444.4
4444.
.00000
0.0000
00.000 <- invalid
000.00 <- invalid
0000.0 <- invalid
00000. <- invalid
.00005
0.0005
00.005 <- invalid
000.05 <- invalid
0000.5 <- invalid
00005. <- invalid
.00055
0.0055
00.055 <- invalid
000.55 <- invalid
0005.5 <- invalid
00055. <- invalid
.00505
0.0505
00.505 <- invalid
005.05 <- invalid
0050.5 <- invalid
00505. <- invalid
.00550
0.0550
00.550 <- invalid
005.50 <- invalid
0055.0 <- invalid
00550. <- invalid
.05050
0.5050
05.050 <- invalid
050.50 <- invalid
0505.0 <- invalid
05050. <- invalid
.05500
0.5500
05.500 <- invalid
055.00 <- invalid
0550.0 <- invalid
05500. <- invalid
.50500
5.0500
50.500
505.00
5050.0
50500.
.55000
5.5000
55.000
550.00
5500.0
55000.
.00555
0.0555
00.555 <- invalid
005.55 <- invalid
0055.5 <- invalid
00555. <- invalid
.05055
0.5055
05.055 <- invalid
050.55 <- invalid
0505.5 <- invalid
05055. <- invalid
.05505
0.5505
05.505 <- invalid
055.05 <- invalid
0550.5 <- invalid
05505. <- invalid
.05550
0.5550
05.550 <- invalid
055.50 <- invalid
0555.0 <- invalid
05550. <- invalid
.50550
5.0550
50.550
505.50
5055.0
50550.
.55050
5.5050
55.050
550.50
5505.0
55050.
.55500
5.5500
55.500
555.00
5550.0
55500.
.05555
0.5555
05.555 <- invalid
055.55 <- invalid
0555.5 <- invalid
05555. <- invalid
.50555
5.0555
50.555
505.55
5055.5
50555.
.55055
5.5055
55.055
550.55
5505.5
55055.
.55505
5.5505
55.505
555.05
5550.5
55505.
.55550
5.5550
55.550
555.50
5555.0
55550.
.55555
5.5555
55.555
555.55
5555.5
55555.
, <- invalid
,, <- invalid
1, <- invalid
,1 <- invalid
22, <- invalid
2,2 <- invalid
,22 <- invalid
2,2, <- invalid
2,2, <- invalid
,22, <- invalid
333, <- invalid
33,3 <- invalid
3,33 <- invalid
,333 <- invalid
3,33, <- invalid
3,3,3 <- invalid
3,,33 <- invalid
,,333 <- invalid
4444, <- invalid
444,4 <- invalid
44,44 <- invalid
4,444
,4444 <- invalid
55555, <- invalid
5555,5 <- invalid
555,55 <- invalid
55,555
5,5555 <- invalid
,55555 <- invalid
666666, <- invalid
66666,6 <- invalid
6666,66 <- invalid
666,666
66,6666 <- invalid
6,66666 <- invalid
66,66,66 <- invalid
6,66,666 <- invalid
,666,666 <- invalid
1,111.
1,111.11
1,111.110
01,111.110 <- invalid
0,111.100 <- invalid
11,11. <- invalid
1,111,.11 <- invalid
1111.1,10 <- invalid
01111.11,0 <- invalid
0111.100, <- invalid
1,111,111.
1,111,111.11
1,111,111.110
01,111,111.110 <- invalid
0,111,111.100 <- invalid
1,111,111.
1,1111,11.11 <- invalid
11,111,11.110 <- invalid
01,11,1111.110 <- invalid
0,111111.100 <- invalid
0002,22.2230 <- invalid
.,5.,., <- invalid
2.0,345,345 <- invalid
2.334.456 <- invalid
\b\d+,
\ b ------->字边界
\ d + ------>一个或数字
,-------->包含逗号,
例如:
sddsgg 70,000 sdsfdsf fdgfdg70,00
sfsfsd 5,44,4343 5.7788,44 555
它将匹配:
70,
5,
44,
,44
这是一个正则表达式:
(?:\d+)((\d{1,3})*([\,\ ]\d{3})*)(\.\d+)?
接受数字:
123456789
,123.123
123 456 789
,123 456 789.100
,123,456
,3,232,300,000.00