I'm now making a web-spider by python,and some part of the program requests me to get some strings like data-id="48859672" from a website. I've successfully got these strings using:
pattern=re.compile(r'\bdata-id="\d+"')
m=pattern.search(html,start)
But I'm now wondering how to only get the number part of the strings,except the whole string?
Use capturing group or lookarounds .
>>> pattern=re.compile(r'\bdata-id="(\d+)"')
>>> s = 'data-id="48859672"'
>>> pattern.search(s).group(1)
'48859672'
OR
>>> pattern=re.compile(r'(?<=\bdata-id=")\d+(?=")')
>>> s = 'data-id="48859672"'
>>> pattern.search(s).group()
'48859672'
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