defcase_insensitive_find(main_string,substring):# 将主字符串和子字符串都转换为小写lower_main_string=main_string.lower()lower_substring=substring.lower()# 查找子字符串的位置position=lower_main_string.find(lower_substring)returnposition# 测试示例main_string="Hello, World!"substring="hello"result=case...
在这个示例中,我们自定义了一个case_insensitive_find函数,首先将输入的字符串和子字符串都转换为小写,然后使用find函数搜索子字符串的位置。 关系图 为了让我们对整个过程有一个更清晰的理解,这里展示一个关系图,描述了字符串处理过程中涉及的元素。 erDiagram STRING { +text: string } SUBSTRING { +text: stri...
position = text.find(substring, position + 1)```输出结果：```The substring 'Python' appears at position 0.The substring 'Python' appears at position 36.
In [144]: val.index(':') --- ValueError Traceback (most recent call last) <ipython-input-144-280f8b2856ce> in <module>() ---> 1 val.index(':') ValueError: substring not found 与此相关,count可以返回指定子串的出现次数: In [145]: val.count(',') Out[145]: 2 replace用于将指...
re.findall:返回包含所有匹配项的列表 re.split:获取一个字符串,在匹配点处拆分它,返回一个列表 re.sub:替换字符串中的一个或多个匹配项 匹配 # syntac re.match(substring, string, re.I) # substring is a string or a pattern, string is the text we look for a pattern , re.I is case ignore...
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) 在文本上使用 findall 会...
By default, the string methods in Python arecase-sensitive. However, you can easily perform case-insensitive checks by converting both the string and the substring to lowercase or uppercase before the comparison. Here’s an example: user_input = "The Big Apple" ...
I IGNORECASE Perform case-insensitive matching. L LOCALE Make \w, \W, \b, \B, dependent on the current locale. M MULTILINE "^" matches the beginning of lines (after a newline) as well as the string. "$" matches the end of lines (before a newline) as well ...
Regex search example find exact substring or word When to use re.search() Search vs. findall Regex search groups or multiple patterns Search multiple words using regex Case insensitive regex search How to usere.search() Before moving further, let’s see the syntax of it. ...
I IGNORECASE Perform case-insensitive matching. L LOCALE Make \w, \W, \b, \B, dependent on the current locale. M MULTILINE "^" matches the beginning of lines (after a newline) as well as the string. "$" matches the end of lines (before a newline) as well ...