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.
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?
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