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Heinz WittenbrinkTutorial zu regulären Ausdrücken in Python - sehe nützlich wenn man mit digitalen Texten arbeitet
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This document is an introductory tutorial to using regular expressions in Python with the re module. It provides a gentler introduction than the corresponding section in the Library Reference. This document is available from http://www.amk.ca/python/howto.
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3.5 Compilation Flags
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Now, you can try matching various strings against the RE [a-z]+ . An empty string shouldn't match at all, since + means 'one or more repetitions'. match() should return None in this case, which will cause the interpreter to print no output. You can explicitly print the result of match() to make this clear.
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