[PerlChina] A hash which contains additional optional highlighting parameters 这个哈希结构该如何创建?

函数为 $excerpts = $sph->BuildExcerpts($docs, $index, $words, $opts)

opts项的说明为:
opts
A hash which contains additional optional highlighting parameters:

before_match - a string to insert before a set of matching words,
default is "<b>"
after_match - a string to insert after a set of matching words,
default is "<b>"

如何预定义这个别opts结构呢?

函数来自于Sphinx::Search模块
http://search.cpan.org/~jjschutz/Sphinx-Search-0.22/lib/Sphinx/Search.pm#BuildExcerpts
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