5.1 忽略大小写 defcheck_substring_case_insensitive(word,substring):returnsubstring.lower()inword.lower()# 示例word="Python"substring="YT"result=check_substring_case_insensitive(word,substring)print(f"'{word}' 是否忽略大小写包含 '{substring}'?{result}") 1. 2. 3. 4. 5. 6. 7. 8. 5.2 ...
if re.search(pattern, string): print("Pattern found!") else: print("Pattern not found.") 忽略大小写 在正则表达式中,可以通过re.IGNORECASE标志来忽略大小写。 if re.search(pattern, string, re.IGNORECASE): 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...
来看⼀个⼩例⼦,假设我们有⼀段⽂本以及⼀条能够识别⼤部分电⼦邮件地址的正则表达式: text = """Dave dave@ Steve steve@ Rob rob@ Ryan ryan@yahoo.com """ pattern = r'[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}' # re.IGNORECASE makes the regex case-insensitive regex...
For example, you want to search a word using regex in a target string, but you don’t know whether that word is in uppercase or lowercase letter or a combination of both. Here you can use there.IGNORECASEflag inside thesearch()method to perform case-insensitive searching of a regex patte...
For bytes patterns, this flag is the only available behaviour and needn't be specified. 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) ...
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...
?2.6. Searching and Replacing Case-Insensitive Text ?question about matchcase(word) function in code block 2. ### FROM NOW ON, SPILT PER TEST CODE BLOCK# flags=re.IGNORECASEtext ='UPPER PYTHON, lower python, MixEd PythOn'print("all python:")print(re.findall('python',text,flags=re.IGNOR...
upper() Converts all the text into an uppercase name = “intellipaat” x = name.lower() # Output: “iINTELLIPAAT” strip() Removes the extra whitespace from the front name = ” INTELLIPAAT” x = name.lower() # Output: “INTELLIPAAT” find() Searches for a substring in the mai...
For bytes patterns, this flag is the only available behaviour and needn't be specified. 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) ...
Remember that these methods to check if a string contains a substring are case sensitive. You will need to use either the string lower() or upper() methods on both the string and substring if you want to do a case insensitive search. ...