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.

Grails default directory

Regular Expression

Lookahead

• q(?=u)  : quit
• q(?!u)  : qtip  not quit

LookBehind

• (?<=a)b  :  abc
• (?<!a)b  :  xbc not ab

• ^ matches at the start of the string
• $ matches at the end of the string
• \d matches a single character that is a digit
• \w matches a "word character" (alphanumeric characters plus underscore)
• \s matches a whitespace character
• The dot matches a single character, except line break characters. It is short for [^\n] (UNIX regex flavors) or[^\r\n] (Windows regex flavors).gr.y matches gray, grey, gr%y, etc.
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