Can anyone help me to solve this problem? I am looking for a single perl regular expression that can replace all occurrentcs of not 'JAZZ' with 'a'. For example, "aJAZJAZZa" should be change to "aaaaJAZZa" I tried to use lookaround feature in Perl but I can't find a solution yet. I sill can not disambiguate between the last 2 'Z' in 'JAZZ'.

In reply to A challenging problem in perl regular expression by yai

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