RegexdrillMultiline: trailing whitespace on every line
A regex exercise from Regexdrill. Solve it with a pattern box with live highlighting in your browser, checked against hidden test strings, and it is checked the moment you submit.
The task
Each test is a block of several lines. Remove the spaces and tabs at the end of every line. Blank lines must stay as blank lines, leading whitespace stays, and nothing else changes. Use the m flag.
What this exercise teaches
[ \t]+$ with the gm flags removes trailing spaces and tabs on every line. \s+$ would swallow line breaks too, joining a blank line to the line above it.
A hint if you get stuck
A class of space and tab, repeated, then $ with the m flag. \s also matches line breaks, which causes a problem here.
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