我有一个类似http://drive.google.com的链接，我想匹配出链接中的"谷歌".
I have:
query: {
bool : {
must: {
match: { text: 'google'}
}
}
}
But this only matches if the whole text is 'google' (case insensitive, so it also matches Google or GooGlE etc). How do I match for the 'google' inside of another string?
重点是您正在使用的ElasticSearch正则表达式requires a full string match:
Lucene’s patterns are always anchored. The pattern provided must match the entire string.
因此，要匹配任何字符(但换行符除外)，可以使用.*模式:
match: { text: '.*google.*'}
^^ ^^
In ES6+, use regexp insted of match:
"query": {
"regexp": { "text": ".*google.*"}
}
还有一个变化是针对字符串可以有换行符的情况:match: { text: '(.|\n)*google(.|\n)*'}.在ElasticSearch中，这个糟糕的(.|\n)*是必须的，因为这个regex风格不允许任何[\s\S]解决方案，也不允许任何DOTALL/Singleline标志."The Lucene regular expression engine is not Perl-compatible but supports a smaller range of operators."
However，如果您不打算匹配任何复杂的模式，也不需要进行单词边界判断，那么使用wildcard search就可以更好地执行regex搜索一个简单的子字符串:
{
"query": {
"wildcard": {
"text": {
"value": "*google*",
"boost": 1.0,
"rewrite": "constant_score"
}
}
}
}
See Wildcard search for more details.
NOTE:通配符模式还需要匹配整个输入字符串，因此
google* finds all strings starting with google*google*查找所有字符串containing google*google查找所有字符串ending with googleAlso, bear in mind the only pair of special characters in wildcard patterns:
?, which matches any single character
*, which can match zero or more characters, including an empty one