Question 1

What does the Leading/Trailing Whitespace regex pattern do?

Accepted Answer

Matches whitespace (spaces, tabs, etc.) at the start or end of each line. Useful for trim operations with regex replace.

Question 2

How do I use the Leading/Trailing Whitespace regex in JavaScript?

Accepted Answer

Use the pattern /^\s+|\s+$/gm with the String.match() or String.matchAll() method. For example: const matches = text.match(/^\s+|\s+$/gm);

Question 3

What regex flags does this pattern use?

Accepted Answer

This pattern uses the global, multiline flags (gm). The global flag finds all matches in the input, not just the first.

Question 4

Which programming languages support this regex?

Accepted Answer

Fully supported in JS, PYTHON, JAVA, PHP, GO

Question 5

What strings does this regex match?

Accepted Answer

This pattern matches strings like:   leading spaces, trailing spaces  , 	tab indented. It does not match strings like: no-whitespace, internal spaces only.

Language	Support
JS	Full support
PYTHON	Full support
JAVA	Full support
PHP	Full support
GO	Full support

Leading/Trailing Whitespace

Pattern

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Explanation

Test Strings

Matching

Non-matching

Language Compatibility

Code Snippets

Related Patterns

Multiple Whitespace