Regular expression finding empty comments in code

Question

i am looking for a regular expression which only finds empty java comments like the following one:

/**
 * 
 */

Eclipse creates those when e.g. generating a serial version id... There is another thread about finding all comments however i didn't manage to adapt the regex to only "filter" out the empty ones.

//.*|("(?:\\[^"]|\\"|.)*?")|(?s)/\*.*?\*/

Any ideas? Thanks!

Ronnie · Accepted Answer · 2013-07-04 13:19:52Z

5

Try this:

\/\*\*[\s\t\r\n]*[ \*]*[\s\t\r\n]*\*/

Should match any string which starts with /**, ends with */ and contains only line breaks, spaces or asterisks in between.

answered Jul 4, 2013 at 13:19

Ronnie

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Community · Accepted Answer · 2017-02-08 14:42:38Z

2

Wouldn't

"\\s*/[*]{2}[*\\s]*[*]/\\s*"

together with the Pattern.MULTILINE flag suffice?

It starts with whitespace (optional), then comes /** then there is only whitespace and * followed by */ optionally followed by more whitespace.

This is how it looks:

Regular expression image

Edit live on Debuggex

edited Feb 8, 2017 at 14:42

CommunityBot

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answered Jul 4, 2013 at 13:19

jlordo

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1 Comment

Lonzak Over a year ago

Thanks for the link to debuggex - din't know that until now. Seems quite helpful especially for a regex padawan like me :-)

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