在Python中,可以使用正则表达式(regex)来替换字符串中的多个单词。下面是一个示例代码: 代码语言:txt 复制 import re def replace_words(text, replacements): pattern = re.compile(r'\b(' + '|'.join(re.escape(word) for word in replacements) + r')\b')
import re # 定义待匹配的字符串 text = "Hello, my email address is example@example.com" # 定义正则表达式模式 pattern = r'\b\w+@\w+\.\w+\b' # 使用re模块的findall函数进行匹配 matches = re.findall(pattern, text) # 打印匹配结果 for match in matches: print(match) 在上述代码中,我们...
# Filename: example, Extension: txt 匹配整数 正则表达式: r'^-?\d+$'解释:匹配正负整数。-? 匹配可选的负号。\d+ 匹配一个或多个数字。import repattern = r'^-?\d+$'numbers = ["123", "-456", "12.34"]for num in numbers: if re.match(pattern, num): print(f"Valid: {num}") ...
Python has a module named re to work with RegEx. Here's an example:import re pattern = '^a...s$' test_string = 'abyss' result = re.match(pattern, test_string) if result: print("Search successful.") else: print("Search unsuccessful.") Run Code ...
RegEx in Python When you have imported theremodule, you can start using regular expressions: ExampleGet your own Python Server Search the string to see if it starts with "The" and ends with "Spain": importre txt ="The rain in Spain" ...
In Python, the caret operator or sign is used tomatch a patternonly at the beginning of the line. For example, considering our target string, we found two things. We have a new line inside the string. Secondly, the string starts with the word Emma which is a four-letter word. ...
Python regex flags To specify more than one flag, use the|operator to connect them. For example, case insensitive searches in a multiline string re.findall(pattern, string, flags=re.I|re.M|re.X) Now let’s see how to use each option flag in Python regex. ...
If you already know the basics of RegEx, jump toPython RegEx. Specify Pattern Using RegEx To specify regular expressions, metacharacters are used. In the above example,^and$are metacharacters. MetaCharacters Metacharacters are characters that are interpreted in a special way by a RegEx engine. Here...
for match in matches: print(f"Match found at index {match.start()}: {match.group()}") 输出 输出显示文本中模式“a”的索引。 re.sub() re.sub() 函数用于将一个字符串替换为另一个字符串。接下来,我们将使用 re.sub() 函数将“Python”替换为“Java”。然后我们打印修改后的字符串。
python import re 定义一个包含多个电子邮件地址的字符串 text = "联系我们:example1@email.com 或 example2@email.com 或 example3@email.com" 定义一个正则表达式模式,用于匹配电子邮件地址 emailpattern = r'\b[A-Za-z0-9.%+-]+@[A-Za-z0-9.-]+.[A-Z|a-z]{2,}\b' ...