正则表达式匹配特定标签

Question

I write a regular expression that is

<w:p.*>\[.*content.*\].*</w:p>

It is working fine. But sometime matches non require tag.

I've found a string from word processing like as

<w:p w:rsidR=‘00E52FD7’ w:rsidRDefault=‘00341592’ w:rsidP=‘000307E7’><w:pPr><w:pStyle w:val=‘Heading1’/><w:contextualSpacing w:val=‘0’/><w:jc w:val=‘center’/></w:pPr><w:r><w:rPr><w:noProof/></w:rPr><w:drawing><wp:inline distT=‘0’ distB=‘0’ distL=‘0’ distR=‘0’ wp14:anchorId=‘4F64B28D’ wp14:editId=‘6522B16C’><wp:extent cx=‘1358306’ cy=‘1343025’/><wp:effectExtent l=‘0’ t=‘0’ r=‘0’ b=‘0’/><wp:docPr id=‘2’ name=‘Picture 2’ descr=‘N:\HUMAN RESOURCES\Logos\Rancho-Logo-Type-Black.png’/><wp:cNvGraphicFramePr><a:graphicFrameLocks xmlns:a=‘http://schemas.openxmlformats.org/drawingml/2006/main’ noChangeAspect=‘1’/></wp:cNvGraphicFramePr><a:graphic xmlns:a=‘http://schemas.openxmlformats.org/drawingml/2006/main’><a:graphicData uri=‘http://schemas.openxmlformats.org/drawingml/2006/picture’><pic:pic xmlns:pic=‘http://schemas.openxmlformats.org/drawingml/2006/picture’><pic:nvPicPr><pic:cNvPr id=‘0’ name=‘Picture 1’ descr=‘N:\HUMAN RESOURCES\Logos\Rancho-Logo-Type-Black.png’/><pic:cNvPicPr><a:picLocks noChangeAspect=‘1’ noChangeArrowheads=‘1’/></pic:cNvPicPr></pic:nvPicPr><pic:blipFill><a:blip r:embed=‘rId7’ cstate=‘print’><a:extLst><a:ext uri=‘{28A0092B-C50C-407E-A947-70E740481C1C}’><a14:useLocalDpi xmlns:a14=‘http://schemas.microsoft.com/office/drawing/2010/main’ val=‘0’/></a:ext></a:extLst></a:blip><a:srcRect/><a:stretch><a:fillRect/></a:stretch></pic:blipFill><pic:spPr bwMode=‘auto’><a:xfrm><a:off x=‘0’ y=‘0’/><a:ext cx=‘1374505’ cy=‘1359042’/></a:xfrm><a:prstGeom prst=‘rect’><a:avLst/></a:prstGeom><a:noFill/><a:ln><a:noFill/></a:ln></pic:spPr></pic:pic></a:graphicData></a:graphic></wp:inline></w:drawing></w:r></w:p><w:p w:rsidR=‘00341592’ w:rsidRPr=‘00341592’ w:rsidRDefault=‘002F27D8’ w:rsidP=‘00341592’><w:pPr><w:pStyle w:val=‘Subtitle’/><w:contextualSpacing w:val=‘0’/><w:rPr><w:sz w:val=‘36’/><w:szCs w:val=‘36’/></w:rPr></w:pPr><w:r><w:t xml:space=‘preserve’>Job Description: </w:t></w:r><w:r w:rsidR=‘00360E41’><w:t>Irrigation/</w:t></w:r><w:r w:rsidR=‘004A20D0’><w:t>Maintenance Worker</w:t></w:r></w:p><w:p w:rsidR=‘000307E7’ w:rsidRDefault=‘000307E7’ w:rsidP=‘000307E7’><w:pPr><w:pStyle w:val=‘Normal1’/></w:pPr><w:bookmarkStart w:id=‘0’ w:name=‘h.17ary2u5jp34’ w:colFirst=‘0’ w:colLast=‘0’/><w:bookmarkEnd w:id=‘0’/></w:p><w:p w:rsidR=‘00007B19’ w:rsidRDefault=‘00007B19’ w:rsidP=‘00341592’><w:pPr><w:pStyle w:val=‘Normal1’/></w:pPr></w:p><w:p w:rsidR=‘00533338’ w:rsidRDefault=‘000307E7’ w:rsidP=‘00341592’><w:pPr><w:pStyle w:val=‘Normal1’/></w:pPr><w:r><w:t xml:space=‘preserve’>Rancho has reviewed the duties described within this job description to ensure that essential functions and basic duties are included.  It is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities required of an incumbent.  An incumbent may be asked to perform other duties as required or assigned by their supervisor.  </w:t></w:r></w:p><w:p w:rsidR=‘00533338’ w:rsidRDefault=‘00533338’ w:rsidP=‘00341592’><w:pPr><w:pStyle w:val=‘Normal1’/></w:pPr></w:p><w:p w:rsidR=‘00710D42’ w:rsidRDefault=‘00710D42’ w:rsidP=‘00341592’><w:pPr><w:pStyle w:val=‘Normal1’/></w:pPr></w:p><w:p w:rsidR=‘004618DB’ w:rsidRDefault=‘004618DB’ w:rsidP=‘004618DB’><w:pPr><w:pStyle w:val=‘Normal1’/></w:pPr><w:r><w:t>[</w:t></w:r><w:proofErr w:type=‘gramStart’/><w:r><w:t>content</w:t></w:r><w:proofErr w:type=‘gramEnd’/><w:r><w:t>]</w:t></w:r></w:p>

My requirement is selecting <w:p> tag which contains

[content]

But this expression matches extra <w:p> tag which not contains my require text.

Any one can help me?

Answer 1

It is advisable to use an XML parser if you have an XML file to deal with. If you have this short fragment only, and you need it to do a one-off task, you may use either of the two regex approaches.

Extract all matches you want and check which one contains [content] , and only return that substring :

Regex.Matches(s, @"(?s)<w:p\b[^>]*>(.*?)</w:p>")
    .Cast<Match>()
    .Where(x => x.Groups[1].Value.Contains("[content]"))
    .Select(z => z.Value);

Note that here, (?s)<w:p\\b[^>]*>(.*?)</w:p> matches <w:p , then asserts there is no word char immediately to the right with a \\b word boundary, then matches the rest of the element by consuming 0+ chars other than > and then > , then it captures any 0+ chars, as few as possible, into Group 1 ( x.Groups[1].Value ) and finally matches </w:p> . The .Where(x => x.Groups[1].Value.Contains("[content]")) condition only keeps those that contain [content] in the inner XML part of the w:p element.

Use a more sophisticated regex with a tempered greedy token:

(?s)<w:p\b[^>]*>(?:(?!<w:p\b).)*?\[content].*?</w:p>

Details

• (?s) - a RegexOptions.Singleline inline option
• <w:p - a <w:p substring
• \\b - word boundary
• [^>]* - 0+ chars other than >
• > - a >
• (?:(?!<w:p\\b).)*? - any char, 0+ times but as few as possible, that is not a starting point for <w:p followed with a word boundary sequence
• \\[content] - a [content] substring
• .*? - any 0+ chars, as few as possible
• </w:p> - a literal </w:p> substring