正则表达式是从信息中搜索特定的模式的一把瑞士军刀。它们是一个巨大的工具库，其中的一些功能经常被忽视或未被充分利用。今天我将向你们展示一些正则表达式的高级用法。
举个例子，这是一个我们可能用来检测电话美国电话号码的正则表达式：
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r'^(1[-\s.])?(\()?\d{3}(?(2)![)[-\s.]?\d{3}[-\s.]?\d{4}$'</span></div></div></td>
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让我们把它放到一个代码片段里：
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import re numbers = [ "123 555 6789", "1-(123)-555-6789", "(123-555-6789", "(123).555.6789", "123 55 6789" ] for number in numbers: pattern = re.match(r'^' r'(1[-\s.])?' # optional '1-', '1.' or '1' r'(\()?' # optional opening parenthesis r'\d{3}' # the area code r'(?(2) ???????????? # if there was opening parenthesis, close it ?????????????????? r'[-\s.]?'??????????????# followed by '-' or '.' or space ?????????????????? r'\d{3}'????????????????# first 3 digits ?????????????????? r'[-\s.]?'??????????????# followed by '-' or '.' or space ?????????????????? r'\d{4}$\s*',number)????# last 4 digits ? ????if pattern: ????????print '{0} is valid'.format(number) ????else: ????????print '{0} is not valid'.format(number) |
????????
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123 555 6789 is valid 1-(123)-555-6789 is valid (123-555-6789 is not valid (123).555.6789 is valid 123 55 6789 is not valid |
?????? python ?????????????????????????????????
?????python ?????�re.compile�?�re.match�??�re.DEBUG�(??????? 128) ?????????????????
正则表达式是从信息中搜索特定的模式的一把瑞士军刀。它们是一个巨大的工具库，其中的一些功能经常被忽视或未被充分利用。今天我将向你们展示一些正则表达式的高级用法。
举个例子，这是一个我们可能用来检测电话美国电话号码的正则表达式：
|
|
r'^(1[-\s.])?(\()?\d{3}(?(2)
让我们把它放到一个代码片段里：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 |
import re numbers = [ "123 555 6789", "1-(123)-555-6789", "(123-555-6789", "(123).555.6789", "123 55 6789" ] for number in numbers: pattern = re.match(r'^' r'(1[-\s.])?' # optional '1-', '1.' or '1' r'(\()?' # optional opening parenthesis r'\d{3}' # the area code r'(?(2)???????????? # if there was opening parenthesis, close it ?????????????????? r'[-\s.]?'??????????????# followed by '-' or '.' or space ?????????????????? r'\d{3}'????????????????# first 3 digits ?????????????????? r'[-\s.]?'??????????????# followed by '-' or '.' or space ?????????????????? r'\d{4}$\s*',number)????# last 4 digits ? ????if pattern: ????????print '{0} is valid'.format(number) ????else: ????????print '{0} is not valid'.format(number) |
????????
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123 555 6789 is valid 1-(123)-555-6789 is valid (123-555-6789 is not valid (123).555.6789 is valid 123 55 6789 is not valid |
?????? python ?????????????????????????????????
?????python ?????�re.compile�?�re.match�??�re.DEBUG�(??????? 128) ?????????????????
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