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並前往https://stackoverflow.com/questions/52064588/how-to-count-recurring-characters-at-the-beginning-of-a-qstring

How to count recurring characters at the beginning of a QString?

Trivially: int number_of_hashes(const QString &s) { int i, l = s.size(); for(i = 0; i < l && s[i] == '#'; ++i); return i; }.

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