Data & Formatting · In-Browser Regular Expression Lab

Whitespace Trim Regex — Strip Leading and Trailing Whitespace

Matches beginning and ending spaces, tabs, and newlines for string sanitization.

Pattern:

Regular Expression Pattern & Flags

Flags:

//g

Live Test String

Match Found

Load Sample:

Match Inspection & Details1 match

Match #1:

Test Samples Verification Matrix

Expected Valid Samples (Should Match)

leading spaces Pass

trailing spaces Pass

both ends Pass

Expected Invalid Samples (Must Reject)

no_spaces Rejected (Pass)

clean text with internal space Rejected (Pass)

Code Implementation Generator

// JavaScript / TypeScript (ES6+)
const pattern = /^\s+|\s+$/g;
const text = "  leading spaces";

const isMatch = pattern.test(text);
console.log("Is Match:", isMatch);

if (isMatch) {
  const matches = text.match(pattern);
  console.log("Matches:", matches);
}

Regular Expression Token Breakdown

Replaces leading `^\s+` or trailing `\s+$` characters with an empty string. Each component of the regular expression serves a distinct syntactical purpose as mapped below: