Convert tabs to spaces phpStorm

Is there easy way to convert tabs to spaces in phpStorm? At the moment I use regex replacing \t->\s\s\s\s and was wondering if there is easy way to do this, since I work with magento and extension developers have never heard of coding standarts, 100 files with tabs...

I assume you are talking about indents (leading spaces). If so:

• Edit | Convert Indents | To Spaces
• Edit | Convert Indents | To Tabs

For this you need to open such file and select text you want to process.

Alternatively: you can process a bunch of files at once via "Code | Reformat Code..." (will be done accordingly to your Code Style).. but that will do actual full reformat, which may not be desirable in some cases (e.g. limited formatting rules; or rules do not fork as you need (limited options; edge cases); or whatever).