在第一个字母数字字符前面标注特殊字符。

Question

我有一个从数据中提取地址的正则表达式。regex查找“地址、地址、地址等”。然后接上后面的字符，直到出现4个整数为止。这包括需要剥离的特殊字符。

我运行一个循环来排除所有特殊字符，如下面的代码所示。我需要代码只删除第一个字母数字字符前面的特殊字符。

输入(来自图像的OCR )：

服务地址-_Unit8-10 LEWIS St，BERRI，SA 5343

        possible_addresses = list(re.findall('Address(.* \d{4}|)|address(.*\d{4})|address(.*)', data)) 
        address            = str(possible_addresses[0])

        for k in address.split("\n"): 
            if k != ['(A-Za-Z0-9)']:
                address_2 = re.sub(r"[^a-zA-Z0-9]+", ' ', k)

现在有：

地址：-_Unit 8-10 LEWIS ST，BERRI SA 5343

address_2 :第8单元10 LEWIS ST BERRI SA 5343

Answer 1

[\W_]*捕捉特殊的字符。

import re
data='Service address —_Unit8-10 LEWIS St, BERRI,SA 5343'
possible_addresses = re.search('address[\W_]*(.*?\d{4})', data,re.I)
address = possible_addresses[1]
print('Address : ' address)

地址:路易斯街8-10号，贝里，SA 5343

Answer 2

我猜想，我们希望在这里设计的表达式应该是从address到四位数的压缩，不包括一些定义好的字符，比如_。然后，让我们从一个带有i标志的简单表达式开始，例如：

(address:)[^_]*|[^_]*\d{4}

演示

我们不想要的任何字符都会出现在这里，[^_]。例如，如果我们将!排除在外，我们的表达式将变成：

(address:)[^_!]*|[^_!]*\d{4}

测试

# coding=utf8
# the above tag defines encoding for this document and is for Python 2.x compatibility

import re

regex = r"(address:)[^_]*|[^_]*\d{4}"

test_str = ("Address: Unit 8 - 10 LEWIS ST, BERRI SA 5343 \n"
    "Address: Got now: __Unit 8 - 10 LEWIS ST, BERRI SA 5343\n"
    "aDDress: Unit 8 10 LEWIS ST BERRI SA 5343\n"
    "address: any special chars here !@#$%^&*( 5343\n"
    "address: any special chars here !@#$%^&*( 5343")

matches = re.finditer(regex, test_str, re.MULTILINE | re.IGNORECASE)

for matchNum, match in enumerate(matches, start=1):

    print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group()))

    for groupNum in range(0, len(match.groups())):
        groupNum = groupNum + 1

        print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.group(groupNum)))

# Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.