我有一些SQL字符串,我想知道字符%s 发生了多少次。
示例字符串:
query_fetch_user = """select * from users where id=%s and email LIKE '%sayhello%' """
这里我想得到%s的确切数量,我想避免将电子邮件部分计算在内。
我尝试了什么。
query_fetch_user.count("%s")
这计算为2
count = start = 0
while True:
start = query_fetch_user.find(sub, start) + 1
if start > 0:
count+=1
else:
print(count)
这也算数为2
但实际计数应为1。
答案 0 :(得分:0)
您可以尝试使用此RegEx:
\B%s\b
它只会匹配独立字词(=
或'
等符号不计入此内容)并且如果它在新行上,则不会中断, String的一行或一行。 Regex101
说明:
\B - Starts where \b does not match - essentially to find where there is a non-word character in front of the text (the start of the line, just after a linebreak, start of the String, period, space, etc)
%s - the String itself (in this case the literal `%s`)
\b - and ends at the word boundary - meaning where the word ends