string ='\n and \r are escape sequences.' result = re.findall(r'[\n\r]', string) print(result)# 输出: ['\n', '\r']
序列 prog=re.compile(pattern)result=prog.match(string) 等价于 result=re.match(pattern,string) 如果需要多次使用这个正则表达式的话,使用re.compile()和保存这个正则对象以便复用,可以让程序更加高效。 注解 通过re.compile()编译后的样式,和模块级的函数会被缓存, 所以少数的正则表达式使用无需考虑编译的问题。
std::cout<<"The string does not match the pattern."<<std::endl; } return0; } 输出结果: Thestringmatches the pattern. 2. 在字符串中搜索匹配项 实例 #include <iostream> #include <string> #include <regex> intmain(){ std::stringtext="123-456-7890 and 987-654-3210"; std::regexpatter...
import re pattern = '^a...s$' test_string = 'abyss' result = re.match(pattern, test_string) if result: print("查找成功.") else: print("查找不成功.") 这里,我们使用re.match()函数来搜索测试字符串中的模式。如果搜索成功,该方法将返回一个匹配对象。如果没有,则返回None。
import re def find_and_merge_words(string): # 使用正则表达式查找字符串中的单词 words = re.findall(r'\b\w+\b', string) # 将单词合并为一个字符串 merged_string = ' '.join(words) return merged_string # 测试代码 string = "Hello, world! This is a test string." merged_string = f...
This regular expression works for me and gives you more control over the start and end value ^(x|y).*(x|y)$ import re #Check if the string starts with "x or y" and ends with "x or y": txt = "xyyyxyx" x1 = re.search("^(x|y).*(x|y)$", txt) txt2 = "y...
re.search(pattern, string, flags=0) 扫描整个 字符串 找到匹配样式的第一个位置,并返回一个相应的 匹配对象。如果没有匹配,就返回一个 None; 注意这和找到一个零长度匹配是不同的。 re.match(pattern, string, flags=0) 如果string 开始的0或者多个字符匹配到了正则表达式样式,就返回一个相应的 匹配对象...
as well as the string. "$" matches the end of lines (before a newline) as well as the end of the string. `S/DOTALL` "." matches any character at all, including the newline. `X/VERBOSE` Ignore whitespace and comments for nicer looking RE's. ...
using System; using System.Text.RegularExpressions; public class Example { public static void Main() { // Get drives available on local computer and form into a single character expression. string[] drives = Environment.GetLogicalDrives(); string driveNames = String.Empty; foreach (string drive ...
The static IsMatch(String, String) method is equivalent to constructing aRegexobject with the regular expression pattern specified by pattern and calling theIsMatch(String)instance method. This regular expression pattern is cached for rapid retrieval by the regular expression engine. ...