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  1. Nerses Nersesyan

    Hi guys, can you help me with this

    Hi guys, can you help me with this ? set my_str "asfdsrwerccbcgsf dfhacbrwet retwsg" regexp -- {([abc])(?=[abc])(?!(\1))} $my_str match couldn't compile regular expression pattern: invalid backreference number is this still true ? The lookahead constraints may not contain back references

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