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Commit b26c095

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‎README.md‎

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* [Theano (神经网络)](https://morvanzhou.github.io/tutorials/machine-learning/theano/)
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* [Keras (快速神经网络)](https://morvanzhou.github.io/tutorials/machine-learning/keras/)
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* [Scikit-Learn (机器学习)](https://morvanzhou.github.io/tutorials/machine-learning/sklearn/)
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* [机器学习实战](https://morvanzhou.github.io/tutorials/machine-learning/ML-practice/)
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* [数据处理](https://morvanzhou.github.io/tutorials/data-manipulation/)
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* [Numpy & Pandas (处理数据)](https://morvanzhou.github.io/tutorials/data-manipulation/np-pd/)
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* [Matplotlib (绘图)](https://morvanzhou.github.io/tutorials/data-manipulation/plt/)

‎basic/36_RegEx.py‎

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import re
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# matching string
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pattern1 = "cat"
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pattern2 = "bird"
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string = "dog runs to cat"
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print(pattern1 in string) # True
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print(pattern2 in string) # False
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# regular expression
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pattern1 = "cat"
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pattern2 = "bird"
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string = "dog runs to cat"
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print(re.search(pattern1, string)) # <_sre.SRE_Match object; span=(12, 15), match='cat'>
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print(re.search(pattern2, string)) # None
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# multiple patterns ("run" or "ran")
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ptn = r"r[au]n" # start with "r" means regular expression
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print(re.search(ptn, "dog runs to cat")) # <_sre.SRE_Match object; span=(4, 7), match='run'>
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# continue
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print(re.search(r"r[A-Z]n", "dog runs to cat")) # None
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print(re.search(r"r[a-z]n", "dog runs to cat")) # <_sre.SRE_Match object; span=(4, 7), match='run'>
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print(re.search(r"r[0-9]n", "dog r2ns to cat")) # <_sre.SRE_Match object; span=(4, 7), match='r2n'>
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print(re.search(r"r[0-9a-z]n", "dog runs to cat")) # <_sre.SRE_Match object; span=(4, 7), match='run'>
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# \d : decimal digit
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print(re.search(r"r\dn", "run r4n")) # <_sre.SRE_Match object; span=(4, 7), match='r4n'>
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# \D : any non-decimal digit
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print(re.search(r"r\Dn", "run r4n")) # <_sre.SRE_Match object; span=(0, 3), match='run'>
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# \s : any white space [\t\n\r\f\v]
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print(re.search(r"r\sn", "r\nn r4n")) # <_sre.SRE_Match object; span=(0, 3), match='r\nn'>
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# \S : opposite to \s, any non-white space
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print(re.search(r"r\Sn", "r\nn r4n")) # <_sre.SRE_Match object; span=(4, 7), match='r4n'>
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# \w : [a-zA-Z0-9_]
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print(re.search(r"r\wn", "r\nn r4n")) # <_sre.SRE_Match object; span=(4, 7), match='r4n'>
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# \W : opposite to \w
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print(re.search(r"r\Wn", "r\nn r4n")) # <_sre.SRE_Match object; span=(0, 3), match='r\nn'>
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# \b : empty string (only at the start or end of the word)
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print(re.search(r"\bruns\b", "dog runs to cat")) # <_sre.SRE_Match object; span=(4, 8), match='runs'>
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# \B : empty string (but not at the start or end of a word)
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print(re.search(r"\B runs \B", "dog runs to cat")) # <_sre.SRE_Match object; span=(8, 14), match=' runs '>
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# \\ : match \
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print(re.search(r"runs\\", "runs\ to me")) # <_sre.SRE_Match object; span=(0, 5), match='runs\\'>
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# . : match anything (except \n)
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print(re.search(r"r.n", "r[ns to me")) # <_sre.SRE_Match object; span=(0, 3), match='r[n'>
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# ^ : match line beginning
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print(re.search(r"^dog", "dog runs to cat")) # <_sre.SRE_Match object; span=(0, 3), match='dog'>
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# $ : match line ending
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print(re.search(r"cat$", "dog runs to cat")) # <_sre.SRE_Match object; span=(12, 15), match='cat'>
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# ? : may or may not occur
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print(re.search(r"Mon(day)?", "Monday")) # <_sre.SRE_Match object; span=(0, 6), match='Monday'>
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print(re.search(r"Mon(day)?", "Mon")) # <_sre.SRE_Match object; span=(0, 3), match='Mon'>
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# multi-line
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string = """
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dog runs to cat.
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I run to dog.
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"""
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print(re.search(r"^I", string)) # None
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print(re.search(r"^I", string, flags=re.M)) # <_sre.SRE_Match object; span=(18, 19), match='I'>
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# * : occur 0 or more times
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print(re.search(r"ab*", "a")) # <_sre.SRE_Match object; span=(0, 1), match='a'>
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print(re.search(r"ab*", "abbbbb")) # <_sre.SRE_Match object; span=(0, 6), match='abbbbb'>
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# + : occur 1 or more times
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print(re.search(r"ab+", "a")) # None
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print(re.search(r"ab+", "abbbbb")) # <_sre.SRE_Match object; span=(0, 6), match='abbbbb'>
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# {n, m} : occur n to m times
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print(re.search(r"ab{2,10}", "a")) # None
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print(re.search(r"ab{2,10}", "abbbbb")) # <_sre.SRE_Match object; span=(0, 6), match='abbbbb'>
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# group
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match = re.search(r"(\d+), Date: (.+)", "ID: 021523, Date: Feb/12/2017")
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print(match.group()) # 021523, Date: Feb/12/2017
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print(match.group(1)) # 021523
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print(match.group(2)) # Date: Feb/12/2017
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# findall
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print(re.findall(r"r[ua]n", "run ran ren")) # ['run', 'ran']
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# | : or
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print(re.findall(r"(run|ran)", "run ran ren")) # ['run', 'ran']
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