如何使用正则表达式查找字符串中是否包含2个特定字符，如果存在则将其删除？

Question

Basically, if I have a string (ex. 'ddbg') python should return 'bg'

I am a little confused as to how to use the regex library for this task.

I have been able to find 1 d and get rid of it... but not 2.

I need to check if a string has only 2 d's and if so remove them.

Answer 1

Try this:

s = "dbdg"
res = re.findall("d", s)
if len(res) == 2:
    s = s.replace("d", "")

Answer 2

Another way without regex (if you don't have to use regex). Strings are iterable so you can check the count of how many times something shows up in a list. If it shows up twice then use the str type replace method to remove it.

    s = "dbdg"
    s = s.replace('d', '') if s.count('d') == 2 else s