Searching file with certain substrings in Code Search has an inconsistent result

Issue Summary

The Code search feature on Bitbucket cloud is giving an inconsistent result while searching with certain substrings of a file name.

Steps to Reproduce

1. In a repository, create a file with the name "_TestFileConnectionWhenContext_Builder.java"
2. Go to the repository Source tab
3. Use the Code search feature by clicking the icon on the left side of the repository
4. Search the following substring:
   • TestFileConnectionWhenContext = Found 1 file
   • TestFileConnectionWhenContextBuilder = Found 1 file
   • TestFileConnectionWhenContextBuild = No result

Expected Results

Searching using substrings of a file name is working

Actual Results

Searching using substrings of a file name is not working

Workaround

Search files locally using a 3rd party code editor