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Regular Expression
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^((0?[1-9]|[12][0-9]|3[01])(Jan|JAN|Mar|MAR|May|MAY|Jul|JUL|Aug|AUG|Oct|OCT|Dec|DEC)([0-9][0-9][0-9][0-9])|(0?[1-9]|[12][0-9]|30)(Apr|APR|Jun|JUN|Sep|SEP|Nov|NOV)([0-9][0-9][0-9][0-9])|(0?[1-9]|1[0-9]|2[0-8])(Feb|FEB)([0-9][0-9][0-9][0-9])|(29)(Feb|FEB)([0-9][0-9])([02468][048]|[13579][26]))$
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gm
Input 1
1
New
1Jan2018 abcd 1Jan18 01Jan18 1Jan2018 01Jan2018 31Jan2018 31jan2018 31jAN2018 31JaN2018 31JAn2018 31JAN2018 28Feb2018 29Feb2018 29Feb2020 31Mar2018 30Apr2018 31Apr2018 31May2018 30Jun2018 31Jun2018 31Jul2018 31Aug2018 30Sep2018 31Sep2018 31Oct2018 30Nov2018 31Nov2018 31Dec2018
Substitution
1Jan2018 abcd 1Jan18 01Jan18 1Jan2018 01Jan2018 31Jan2018 31jan2018 31jAN2018 31JaN2018 31JAn2018 31JAN2018 28Feb2018 29Feb2018 29Feb2020 31Mar2018 30Apr2018 31Apr2018 31May2018 30Jun2018 31Jun2018 31Jul2018 31Aug2018 30Sep2018 31Sep2018 31Oct2018 30Nov2018 31Nov2018 31Dec2018