javascript - Using string.prototype.replace with a regexp and a function -


the following returns 'entiy'. want return 'entity'. how can achieve this?

'entities '.replace(/\w(ies)(?:[\w|$|_])+/g, 'y');

just capture character before "ies":

'entities '.replace(/(\w)(ies)(?:[\w|$|_])+/g, '$1y');

now question asked using function; can too:

'entities '.replace(/(\w)(ies)(?:[\w|$|_])+/g, function(_, before, repl) {   return before + "y"; });

i don't know want subsequent stuff after "ies"; can either capture , glue replacement, or else use positive look-ahead. portions of input text matched look-ahead not part of match involved replacement operation. in other words, look-ahead succeed or fail based on pattern, characters matched not made part of "to replaced" grouping.


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