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 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...
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.search(pattern_ignore_case, text, re.IGNORECASE) # Case-insensitive searchp...
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 ...
Case-insensitive regexUsage examples for regular expressions in Python.Unless otherwise stated, examples use Python 3. See all examples on this jupyter notebookString matches regexThe pattern must match at the beginning of the string. To match the full string, see belowUse...
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...
如果打算对许多字符串应用同一条正则表达式,强烈建议通过re.compile创 建regex对象。这样将可以节省大量的CPU时间。 match和search跟findall功能类似。findall返回的是字符串中所有的匹配项, 而search则只返回第一个匹配项。match更加严格,它只匹配字符串的首 部。来看一个小例子,假设我们有一段文本以及一条能够识别...
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...
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.") ...