上述代码中,我们使用find()函数在转换后的字符串string_lower中查找转换后的子串substring_lower。find()函数会返回子串在字符串中的起始位置,如果找不到则返回-1。 4. 完整代码示例 下面是完整的代码示例: deffind_case_insensitive(string,substring):string_lower=string.lo
来看⼀个⼩例⼦,假设我们有⼀段⽂本以及⼀条能够识别⼤部分电⼦邮件地址的正则表达式: text = """Dave dave@ Steve steve@ Rob rob@ Ryan ryan@yahoo.com """ pattern = r'[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}' # re.IGNORECASE makes the regex case-insensitive regex...
= -1:print(f"The substring '{substring}' (case-insensitive) first appears at position {position}.")else:print(f"The substring '{substring}' (case-insensitive) was not found in the text.")```输出结果：```The substring 'PYTHON' (case-insensitive) first appears at position 0.```3. 逆...
You can pass many options to the configure script; run./configure --helpto find out more. On macOS case-insensitive file systems and on Cygwin, the executable is calledpython.exe; elsewhere it's justpython. Building a complete Python installation requires the use of various additional third-pa...
可以看到,headers 和 cookies 这两个属性得到的结果分别是 CaseInsensitiveDict 和 RequestsCookieJar 类型。 在第一章我们知道,状态码是用来表示响应状态的,比如返回 200 代表我们得到的响应是没问题的,上面的例子正好输出的结果也是 200,所以我们可以通过判断 Response 的状态码来知道爬取是否爬取成功。 requests 还...
text = """Dave dave@google.com Steve steve@gmail.com Rob rob@gmail.com Ryan ryan@yahoo.com """ pattern = r'[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}' # re.IGNORECASE makes the regex case-insensitive regex = re.compile(pattern, flags=re.IGNORECASE) ...
1#match,从起始位置开始匹配,匹配成功返回一个对象,未匹配成功返回None234match(pattern, string, flags=0)5#pattern: 正则模型6#string : 要匹配的字符串7#falgs : 匹配模式8X VERBOSE Ignore whitespaceandcommentsfornicer looking RE's.9I IGNORECASE Perform case-insensitive matching.10M MULTILINE"...
You can pass many options to the configure script; run./configure --helpto find out more. On macOS case-insensitive file systems and on Cygwin, the executable is calledpython.exe; elsewhere it's justpython. Building a complete Python installation requires the use of various additional third-pa...
a = float('inf') b = float('nan') c = float('-iNf') # These strings are case-insensitive d = float('nan')Output:>>> a inf >>> b nan >>> c -inf >>> float('some_other_string') ValueError: could not convert string to float: some_other_string >>> a == -c # inf==...
text="Learning Python is fun!"substring="Python"iftext.find(substring)!=-1:print(f'"{text}" contains "{substring}"')else:print(f'"{text}" does not contain "{substring}"') Copy 3. How to perform a case-insensitive string check?