Trouble with remove_if (it stops removing after a few removals)

Question

The code below wants to take a string and output only lowercase letters from the English alphabet. ``` string simplifyString(string word) { word.erase(remove_if(word.begin(), word.end(), [](char letter){return !isalpha(letter);})); transform(word.begin(), word.end(), word.begin(), tolower); return word; } int main() { string s = "a.b.c.d.e.f.g.h."; cout << simplifyString(s) << endl;; return 0; } ``` The output is: abcdefgh.f.g.h. So the code works and then stops working. What the heck is going on?

Accepted Answer

```
word.erase(remove_if(...));
```

That's close but not quite right. That only removes the first element set aside by `remove_if`. You want to remove the entire range:

```
word.erase(remove_if(...), word.end());
```

Trouble with remove_if (it stops removing after a few removals)

Solution

Problem