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Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.0 Content-language: en-US To: Zsh Users From: Ray Andrews Subject: [[ 'abcde' =~ (#i)Bcd ]] Content-type: text/plain; charset=UTF-8; format=flowed Content-transfer-encoding: 8bit X-Seq: 28325 Archived-At: X-Loop: zsh-users@zsh.org Errors-To: zsh-users-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-users-request@zsh.org X-no-archive: yes List-Id: List-Help: , List-Subscribe: , List-Unsubscribe: , List-Post: List-Owner: List-Archive: [[ 'abcde' =~ 'bcd' ]] && echo match1 [[ 'abcde' = (#i)ABcde ]] && echo match2 [[ 'abcde' =~ (#i)Bcd ]] && echo match3 [[ 'bcd' =~ 'abcde' ]] && echo match4 ... I get match 1 and match 2.  I  understand not getting match 4 because '=~' is not bi-directional, the latter value must be a subset of the former.  But why don't I get match 3? It seems to break no rules to make 'Bcd' case insensitive and then find it within 'abcde'.  Is there a workaround?