exmpl 0 t h i s a r e t he spaces to d e l e t e
exmpl 1 m o r e spaces to d e l
exmpl 2 o r s m t h completely d i f f e r e n t
exmpl 12 y e t another l i n e

exmpl 0 thisarethespacestodelete
exmpl 1 morespacestodel
exmpl 2 orsmthcompletelydifferent
exmpl 12 yetanotherline

sed -i 's/(exmpls*[0-9]*s*)(.*)/12/'