pythontext = "Hello World"pattern = r"hello" # Case-sensitive searchmatch_case_sensitive = re.search(pattern, text)print(match_case_sensitive) # Output: Nonepattern_ignore_case = r"hello"match_ignore_case = re
match_case_insensitive = re.search(pattern_case_insensitive, text, re.IGNORECASE)if match_case_insensitive:print(f"Ignore case match: {match_case_insensitive.group()}")# 多行模式下的匹配 multi_line_text = """First line Second line Third line"""pattern_multiline = r'^Second'match_multi...
print(f"Username: {username}, Domain: {domain}")- **使用标志**：通过传递额外的标志参数给 `re` 函数，可以增强正则表达式的灵活性。例如，`re.IGNORECASE` 忽略大小写，`re.MULTILINE` 使 `^` 和 `$` 匹配每一行的开头和结尾。case_insensitive_match = re.search(r'the', text, re.IGNORECASE)pr...
case_insensitive_match=re.search("hello","Hello World!",flags=re.IGNORECASE)ifcase_insensitive_match:print("Case-insensitive match found!") 1. 2. 3. 常见的标志包括: 复制 re.IGNORECASE或 re.I:忽略大小写的匹配。 re.MULTILINE或 re.M:多行模式,改变'^'和'$'的行为。 re.DOTALL或 re.S:让...
print(f"The word 'Python' appears {count} times (case insensitive).") 二、在文件中检测字段出现次数 1、读取文件内容 在实际应用中,我们经常需要在文件中查找某字段的出现次数。首先,我们需要读取文件内容。示例如下: with open('example.txt', 'r') as file: ...
Case-insensitive matches in Unicode use full case-folding by default. 如果未指定版本,则regex模块将默认为regex.DEFAULT_VERSION。 2. Unicode中不区分大小写的匹配:Case-insensitive matches regex模块支持简单和完整的大小写折叠,以实现Unicode中不区分大小写的匹配。可以使用FULLCASE或F标志或模式中的(?f)来打开...
1. match(pattern, string, flags=0) 从字符串的开头进行匹配, 匹配成功就返回一个匹配对象,匹配失败就返回None flags的几种值 X 忽略空格和注释 I 忽略大小写的区别 case-insensitive matching S . 匹配任意字符,包括新行 def match(pattern, string, flags=0):"""Try to apply the pattern at the start...
Perform case-insensitive matching; expressions like[A-Z]will match lowercase letters, too. This is not affected by the current locale. re.L re.LOCALE Make\w,\W,\b,\B,\sand\Sdependent on the current locale. re.M re.MULTILINE When specified, the pattern character'^'matches at the beginn...
re.DOTALLre.SMakes the . character match all characters (including newline character)Try it » re.IGNORECASEre.ICase-insensitive matchingTry it » re.MULTILINEre.MReturns only matches at the beginning of each lineTry it » re.NOFLAGSpecifies that no flag is set for this pattern ...
print("Pattern found (case-insensitive)!") 复杂模式 正则表达式可以用于查找复杂的模式,例如电话号码、电子邮件地址等。 email = "example@example.com" pattern = r"[^@]+@[^@]+\.[^@]+" if re.match(pattern, email): print("Valid email address.") ...