Python 正则表达式替换所有的<b>为<strong>

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1. Replace all <b> with <strong>, preserving any existing attributesMatch:<(/?)b\b((?:[^>"']| "[^"]*"| '[^']*')*)>Replace:<\1strong\2>eg.<b fdjfkjdk>inikkk</b fdjkfjk>====><strong fdjfkjdk>inikkk</strong fdjkfjk>2. Replace all <b> with <strong>, discarding any existing attributesMatch:<(/?)b\b((?:[^>"']| "[^"]*"| '[^']*')*)>Replace:<\1strong\2>eg.<b fdjfkjdk>inikkk</b fdjkfjk>====><strong>inikkk</strong>3. Replace a list of tags (<b> <i> <em> <big>) with <strong>, preserving any existing attributesMatch:<(/?)([bi]|em|big)\b((?:[^>"']| "[^"]*"| '[^']*')*)>Replace:<\1strong\3>eg.<b fdjfkjdk>inikkk</b fdjkfjk><i fff>nihao</i nihao><em ff>nihao</em nihao><big ff>nihao</big nihao>=====><strong fdjfkjdk>inikkk</strong fdjkfjk><strong fff>nihao</strong nihao><strong ff>nihao</strong nihao><strong ff>nihao</strong nihao>4. Replace a list of tags (<b> <i> <em> <big>) with <strong>, discarding any existing attributesMatch:<(/?)([bi]|em|big)\b((?:[^>"']| "[^"]*"| '[^']*')*)>Replace:<\1strong>eg.<b fdjfkjdk>inikkk</b fdjkfjk><i fff>nihao</i nihao><em ff>nihao</em nihao><big ff>nihao</big nihao>=====><strong>inikkk</strong><strong>nihao</strong><strong>nihao</strong><strong>nihao</strong>

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