Java Regex, remove leading spaces of each line

Question

Want to use Java String.replaceAll(regex, "") to remove all leading spaces of each line in a multi-line text string. if possible remove all carriage-returns as well. What the "regex" should be?

anubhava · Accepted Answer · 2020-04-22 06:21:13Z

4

Converting my comment to answer so that solution is easy to find for future visitors.

You may use regex replacement in Java:

str = str.replaceAll("(?m)^\\s+|\\s+$", "");

RegEx Details:

(?m): Enable MULTILINE mode so that ^ and $ are matched in every line.
^\\s+: Match 1+ whitespaces at line start
|: OR
\\s+$: Match 1+ whitespaces before line end

answered Apr 22, 2020 at 6:21

anubhava

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