What is JIRA searching when JQL filter value is: summary ~ "[TEXT1 TEXT2]" ?

[franburgos]

I read about special characters and how scape them on: https://confluence.atlassian.com/jiracoreserver073/search-syntax-for-text-fields-861257223.html

But I would like understand what is the query underlaying the filter:

summary ~ "[TEXT1 TEXT2]"

Search all issues whose summary field contains text1 or text2? because the results list displays issues which haven't any of that words on their summary field.

[Mirek]

If you combine multiple terms without specifying any Boolean operators, normally they will be joined using AND operators. Could you paste some summary examples of that is displayed for you?