console.log(
'<image transform="matrix(1,0,0,1,0,0)" preserveAspectRatio="none" x="97" y="0" width="411" height="437" xlink:href="/images/1.png"></image><image transform="matrix(1,0,0,1,0,0)" preserveAspectRatio="none" x="97" y="0" width="411" height="437" xlink:href="/images/2.png"></image>'
.replace(/(xlink:href=")/g, '$1http://javascript.ru')
)
//>>>> <image transform="matrix(1,0,0,1,0,0)" preserveAspectRatio="none" x="97" y="0" width="411" height="437" xlink:href="http://javascript.ru/images/1.png"></image><image transform="matrix(1,0,0,1,0,0)" preserveAspectRatio="none" x="97" y="0" width="411" height="437" xlink:href="http://javascript.ru/images/2.png"></image>