How To Remove Extra Whitespace
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What counts as whitespace
More than just the space character. The Unicode whitespace class includes:
Trim
Remove leading and trailing whitespace, leave the middle alone. Every language has a built-in. In regex:
Collapse runs of whitespace
Replace any run of whitespace with a single space:
Preserve line structure while collapsing intra-line runs
This flattens tabs, multiple spaces, and any line breaks inside. Combine with trim for the classic “clean up this mess” pass:
Non-breaking spaces
NBSP (U+00A0) is the villain of copy-paste workflows. It looks identical to a space in most fonts but:
Tab-to-space conversion
Tabs render differently across editors and cause alignment chaos in mixed-indent code. Convert to N spaces:
Preserving code indentation
For column alignment (tab-expand), you need tab stops:
Trailing whitespace per line
The most universally safe cleanup: strip trailing whitespace on every line. Never breaks meaning, cleans up editor artifacts.
Blank-line collapse
Two or more blank lines becomes one:
Full normalization pipeline
Three or more newlines means two or more blank lines (because one newline is the end of a line, not a blank line).