解析不同的日期格式：正则表达式

重新发布这个问题并附上具体细节（因为最后一个问题已被标记下来）。

我正在努力从档案卡中解析混乱的 (tesseract-ocr)，以获取至少 50% 的信息 (date1)。数据行包含不同形式的日期，如下面的数据示例所示。

Raw_Text
1   "15957-8 . 3n v g - vw, 1 ekresta . bowker, william e tley n0 .qu v- l. c. 
    s. peteris, forestville, n. y. .mafae date1 june 17,1942 by davis, c. j6 
    l. g. b. jonnis, buffalo, n. y. ngsted decl 17, 1949.3y 7 davis, c. j. 
    date3 by j date4 - by date5 by 6 -.5/, 7/19/l date6 17 jul 1916 salamanca. 
    hf date7 31 dec 1986 buffalo, new york "
2   ".1o2o83n5ddn.. -i ekresta i bowles, albert edwin i made date1 june 9p1909 
    by parker, elm. date2 dec . 18 w date3 . by dep osed by date5 by date7mqm 
    9 ivvld wm 4144, mac, .75 076 eaqlwli "
3   "i naime bowles, charles edward made date1 may 31. 1892 by mclaren, wneoi 
    date2 may 18. 1895 by mclaren, w.e. date3 . i by date4 may 10. 1908 by 
    bip. of chicago. date5 by date7 "
4   "101 557 am l i ekrestaibowles, donald manson ..46 ohio trlnlty cathedral, 
    cleveland, ohio made date1 6/19/76 by burt, ji. h. grace , cleveland, ohio 
   date2 11 jun 77 by bp j h burt date3 . 1 .. by date4 by date5 bv m cuyahoga 
   heights, ohio date6 4/29/27 date7 240000 "
5   "227354 101 575 m68, frederick augustus st. paujjs cathedral, buffalo, 
   n.y. made date1 6/15/63 by scaife. l.i... st. thomas. modia, bath, n.y. 
   date2 1/11/611 by scaife. l.eo date3 by date4 by date5 by bradford, n.y. i 
   . 130m 6/1/18 date7 17 jun 1996 foratvme new york z4uc-xl "
6   "1 95812d ll. il ekresta bowles, harry oscar lmade date14 july 17, 190433, 
    lepnard, w.a. date2 july 25 , 1905 by leonard, w.a. i date3 by date4 by 
   date5 by g- m. /(,,/mr date7 jay /z/,. /357i l /mwi yk/maj. "
7   "5025 ,.. 2.57631 il . - . .. .1 i ekresta bowles , jedwiah hibbafd made 
    deac0n 8., i5-0i1862i13y potter, iih. date2 10. 280 1864 1 biy stevens, w. 
    b. date3 by date4 7 .30 l 1875 by date5 by date7 "
8   "30.611126 ekhq il ekresta bowles, ralph hart made date1 12. 210 i1883 by 
    iwiiiliams, i36 date2 7.. 1. 1885 by williams , j. date3 by i date4 by 
    date5 by g .97) l/am 9- date7 10. 4. 1900 (78) if x/ma 3.4, 154.47.11.73. 
    4,... mya-ix "
9   "2.25678 . 1o14593 ekresta bowles, robert brigham, jr. st. matthew s 
    cathedra1,da11quexas made date1 6/18/65 by mason, c. a. 57 mmzws camp 
    dr7///9s tams date2 12 21 cs by 14.45.42 c a date3 i by date4 by date5 , 
    by houston, texas date6 4/11/30 date7 12 dec 2000 dallas texas 2400-xi "
10  "101 619 34hq woe ekresta bowlin1 howard bruce cathedral modia of saint 
    peter 61 st. paul, washin ton, dc made date1 13 jun 92 bybp r h haines 
   (wdc st. alban1s modia, annandale, vir inia . pdumd 16 jan 93 by r h halnes 
    (wdc) date3 by atas by date4 v by date5 by date6 31 aug 1946 e st. louis. 
   il date7 2400-i "
11  "w k8 8km tm boiling jack dnnmwm q- f grace ch , made dat j 11201). salem 
    mares. stverrett. f. ,w a x st. johms modia. memphis, tenh. date1 apr. 25. 
    1955 - bv barth, t.in.. date3 4 by date4 by date5 by date7 wq iw r 1 w .n 
    . 4.1- 1 date6z1l7i1c. "

我通过两步过程解析 date1， - 1. 解析名称“date1”和“by”之间的文本 - 2.使用日期解析器提取实际日期

import re
import dateutil.parser as dparser
for lines in Raw_Text:
    lines = lines.lower() #make lower case
    lines = lines.strip() #remove leading and ending spaces
    lines = " ".join(lines.split()) #remove duplicated spaces



    # Step 1
    #Extract data between "date1" and "by"
    deacondt = re.findall(r'date1(.*?)by',lines)

    deacondt = ''.join(deacondt)  #Convert list to a string


    # Step 2
    # use dateutil to parse dates in extracted data

    try:
        deacondt1 = dparser.parse(deacondt)
    except:
        deacondt1 = 'NA'

    print deacondt1

步骤 1 的输出为，

[' june 17,1942 ']
[' june 9p1909 ']
[' may 31. 1892 ']
[' 6/19/76 ']
[' 6/15/63 ']
['4 july 17, 190433, lepnard, w.a. date2 july 25 , 1905 ']
[]
[' 12. 210 i1883 ']
[' 6/18/65 ']
[' 13 jun 92 ']
[]

而步骤 2 返回以下输出

2018-06-17 00:00:00
1909-06-17 21:00:00
1892-05-31 00:00:00
1976-06-19 00:00:00
2063-06-15 00:00:00
NA
NA
NA
2065-06-18 00:00:00
1992-06-13 00:00:00
NA

第 2 步未能给出所有日期。 Python 2.7 是否有比“dateutil.parser”更好的日期解析器？

你可以试试这个，

deacondt1 = dparser.parse(deacondt, dayfirst=False, fuzzy=True)

• fuzzy– 允许字符串包含un-dateformat这样的词 ”Today is January 1, 2047 at 8:21:00AM”.
• dayfirst=False means month-first date-format输入像你一样的字符串。

但这还不足以dateutil-parser要提取所需的输出，因此需要将更近似的日期格式字符串传递给解析器。

Regex提取有关的字符串date1

(?s)date1\d?((?:(?!by|date2|date3).)*)

Demo, 其中不仅 'by' 但是也 'date2' and 'date3' 用作separator and date10~date19被视为date1.

然后，对提取的字符串进行操作（删除前导和尾随空格等）以获得 date-util 解析器可接受的输入。

regx= re.compile(r'(?s)date1\d?((?:(?!by|date2|date3).)*)')
raw_date= [re.sub(r'(?i)(?<=\s)[a-z]?(\d{4}|\d{2})\d*', r'\1', re.sub(r'\s+|,|(?<=\d)[^\d\s\/](?=\d)',' ', re.sub(r'^\s+|\s+$|\n+','', m))) for m in regx.findall(Raw_Text)]

for deacondt in raw_date: 
    try:
        deacondt1 = dparser.parse(deacondt, dayfirst=False, fuzzy=True)
    except:
        deacondt1 = 'NA'

print(deacondt +"\n"+ str(deacondt1))

Output

june 17 1942
1942-06-17 00:00:00
june 9 1909
1909-06-09 00:00:00
may 31. 1892
1892-05-31 00:00:00
6/19/76
1976-06-19 00:00:00
6/15/63
2063-06-15 00:00:00
july 17  1904  lepnard  w.a.
1904-07-17 00:00:00
12. 21 1883
1883-12-21 00:00:00
6/18/65
2065-06-18 00:00:00
13 jun 92
1992-06-13 00:00:00
apr. 25. 1955 - bv barth  t.in..
1955-04-25 00:00:00