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space_variants

redstr

Function space_variants 

Source 
pub fn space_variants(input: &str) -> String
Expand description

Replaces regular spaces with various Unicode space characters.

Substitutes ASCII space characters (U+0020) with random Unicode space variants including non-breaking space (U+00A0) and various em/en spaces. These look identical but have different codepoints, useful for testing whitespace normalization and parser robustness.

§Use Cases

  • WAF Bypass: Evade filters that only check for ASCII spaces
  • Blue Team: Test whitespace normalization in parsers
  • Input Validation: Verify proper handling of Unicode spaces
  • SQL Injection: Use non-breaking spaces to bypass filters

§Examples

use redstr::space_variants;

let result = space_variants("hello world");
// Looks identical: "hello world"
// But may contain U+00A0, U+2000, U+2001, etc. instead of U+0020
assert_eq!(result.chars().filter(|c| c.is_whitespace()).count(), 1);

// SQL injection with Unicode spaces
let sql = space_variants("SELECT * FROM users");
// Uses non-breaking spaces to bypass filters

// Test whitespace normalization
let text = space_variants("word1 word2 word3");
// Visually identical but with mixed Unicode spaces