Unable to search for issue using words separated by _ (underscore) or - (dash/hyphen) in a text field

Issue Summary

Unable to search for issues using words separated by _ (underscore) or - (dash/hyphen) in a text field 

Steps to Reproduce

1. Create an issue with the summary - ABC_PQR_XYZ or ABC-PQR-XYZ
2. Search for issues using the JQL 

   summary ~ 'PQR'

Expected Results

The issue created in Step 1 should be listed.

Actual Results

The issue may or may not be listed.

Workaround

Try being more specific in the search using more words. For example, try searching for summary ~ 'ABC_PQR or summary ~ 'ABC_PQR_XYZ'