javascript - JS Replace String starting with space and ending with space or comma or dot with another string -


i know basic javascript regex. confused lookheads. title says, want replace word word if ends space, dot(.) or comma(,) eg: replacing "his" "her" in following text

"xyz his, his."

to 

"xyz her, her." 

input.replace(/\b([hh])is(?=[., ])/g, '$1er')

lookahead 0 width assertion check not match input..

with above regex matching his followed [., ]..

\b word boundary let match individual words..


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