字段和记录的边界和XML文档的边界不匹配。
Field and record boundaries just don't match the boundaries of an XML document.
这组待选对象随后使用大小写不敏感的单词边界括起(\c\<\(...\)\>),确保只有完整的单词被匹配,而不需要关心大小写。
That set of alternatives is then bracketed by case-insensitive word boundaries (\c\<\(...\)\>) to ensure that only entire words are matched, regardless of capitalization.
如果把“engineering”拿去匹配,正则引擎会先匹配到“engineer”,但接下来就遇到了字词边界,b,所以匹配不成功。
If the regex engine is given the word 'engineering', it will correctly match 'engineer'. The next word boundary, \ b, will not match.
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