How to change Eclipse to use spaces instead of tabs

For the default text editor:

• General > Editors > Text Editors > Insert spaces for tabs (check it)

For PHP:

• PHP > Code Style > Formatter > Tab policy (choose "spaces")
• PHP > Code Style > Formatter > Indentation size (set to 4)

For CSS:

• Web > CSS > Editor > Indent using spaces (select it)
• Web > CSS > Editor > Indentation size (set to 4)

For HTML:

• Web > HTML > Editor > Indent using spaces (select it)
• Web > HTML > Editor > Indentation size (set to 4)

For XML:

• XML > XML Files > Editor > Indent using spaces (select it)
• XML > XML Files > Editor > Indentation size (set to 4)

For Javascript:

• Javascript > Preferences > Code Style > Formatter > Edit > Indentation (choose "spaces only")
• Rename the formatter settings profile to save it

For Java:

• Java > Preferences > Code Style > Formatter > Edit > Indentation (choose "spaces only")
• Rename the formatter settings profile to save it

To search for all the tabs in eclipse.

Search > File > search for containing text "\t" and select Regular expression > Search

To replace tab with spaces

Search > File > search for containing text "\t" and select Regular expression > Replace > Enter 4 spaces.