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--- markow:the_most_wanted_letter [2017/09/05 22:54] – alte Version wiederhergestellt (2017/09/05 22:51) Tscherter Vincent
+++ markow:the_most_wanted_letter [2019/08/25 23:03] (aktuell) – Externe Bearbeitung 127.0.0.1
@@ Zeile 1: / Zeile 1: @@
+====== The Most Wanted Letter ======
+{{ :markow:pasted:20170905-223332.png?300}}
+You are given a text, which contains different english letters and punctuation symbols. You should find the most frequent letter in the text. The letter returned must be in lower case.
+While checking for the most wanted letter, casing does not matter, so for the purpose of your search, ''A'' == ''a''. Make sure you do not count punctuation symbols, digits and whitespaces, only letters.
+If you have two or more letters with the same frequency, then return the letter which comes first in the latin alphabet. For example -- ''one'' contains ''o'', ''n'', ''e'' only once for each, thus we choose ''e''.
+== Examples ==
+^ Input ^ Output |
+| ''Hello World!'' | ''l'' |
+| ''How do you do?'' | ''o'' |
+| ''One'' | ''e'' |
+| ''Oops!'' | ''o'' |
+| ''AAaooo!!!!'' | ''a'' |
+| ''abe'' | ''a'' |
+== Solution ==
+<code text>/[^a-zζ]//ig
+/ζ([^ζ])(.*)ζ\1/ζζ$1$2/i
+/^(ζ+)[^ζ](.*)\1/$2$1/
+/^(ζ+[^ζ])(.+)/$2$1/
+/ζ//g !
+/(.)/ζ$1/g </code>

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