去掉word冗余格式 java正则表达式

      word转换html时，会留下很多格式，有些格式并不是我们所需要的，然而这些格式比真正的文章内容还要多，严重影响页面的加载速度，因此就需要找个一个好的解决方案把这些多余的格式个去掉。网上有很多去除word冗余格式的js版的正则表达式，这里只提供java版的正则表达式。

 

 

	public static String clearWordFormat(String content) {
		//把<P></P>转换成</div></div>保留样式
		//content = content.replaceAll("(<P)([^>]*>.*?)(<\\/P>)", "<div$2</div>");
		//把<P></P>转换成</div></div>并删除样式
		content = content.replaceAll("(<P)([^>]*)(>.*?)(<\\/P>)", "<p$3</p>");
		//删除不需要的标签
		content = content.replaceAll("<[/]?(font|FONT|span|SPAN|xml|XML|del|DEL|ins|INS|meta|META|[ovwxpOVWXP]:\\w+)[^>]*?>", "");
		//删除不需要的属性
		content = content.replaceAll("<([^>]*)(?:lang|LANG|class|CLASS|style|STYLE|size|SIZE|face|FACE|[ovwxpOVWXP]:\\w+)=(?:'[^']*'|\"\"[^\"\"]*\"\"|[^>]+)([^>]*)>", "<$1$2>");
		//删除<STYLE TYPE="text/css"></STYLE>及之间的内容
		int styleBegin = content.indexOf("<STYLE");
		int styleEnd = content.indexOf("</STYLE>") + 8;
		String style = content.substring(styleBegin, styleEnd);
		content = content.replace(style, "");
		return content;
	}

 

 

去除不需要的标签

 

 

<[/]?(font|FONT|span|SPAN|xml|XML|del|DEL|ins|INS|meta|META|[ovwxpOVWXP]:\\w+)[^>]*?>

 

 

• match an open tag character <
• and optionally match a close tag sequence </  (because we also want to remove the closing tags)
• match any of the list of unwanted tags: font,span,xml,del,ins
• a pattern is given to match any of the namespace tags, anything beginning with o,v,w,x,p, followed by a : followed by another word
• match any attributes as far as the closing tag character >
• the replace string for this regex is "", which will completely remove the instances of any matching tags.
• note that we are not removing anything between the tags, just the tags themselves

去除不需要的属性

<([^>]*)(?:lang|LANG|class|CLASS|style|STYLE|size|SIZE|face|FACE|[ovwxpOVWXP]:\\w+)=(?:'[^']*'|\"\"[^\"\"]*\"\"|[^>]+)([^>]*)>

 

• match an open tag character <
• capture any text before the unwanted attribute (This is $1 in the replace expression)
• match (but don't capture) any of the unwanted attributes: class, lang, style, size, face, o:p, v:shape etc.
• there should always be an = character after the attribute name
• match the value of the attribute by identifying the delimiters. these can be single quotes, or double quotes, or no quotes at all.
• for single quotes, the pattern is: ' followed by anything but a ' followed by a '
• similarly for double quotes. 
• for a non-delimited attribute value, i specify the pattern as anything except the closing tag character >
• lastly, capture whatever comes after the unwanted attribute in ([^>]*)
• the replacement string <$1$2> reconstructs the tag without the unwanted attribute found in the middle.
• note: this only removes one occurence of an unwanted attribute, this is why i run the same regex twice.  For example, take the html fragment: <p class="MSO Normal" style="Margin-TOP:3em"> 
  the regex will only remove one of these attributes.  Running the regex twice will remove the second one.  I can't think of any reasonable cases where it would need to be run more than that.