String Manipulation Methods

const template = '${name} is ${age} years old';
const result = template.replace(/\${(\w+)}/g, (_, key) => values[key]);

Simple string replacement
Template string interpolation
Variable substitution
This demonstrates custom template string interpolation: 1) Uses regex to find ${variable} patterns, 2) Extracts variable names from matches, 3) Replaces patterns with corresponding values, 4) Implements custom template system, 5) Useful for dynamic string generation, 6) Common in template engines, 7) More flexible than built-in template literals, 8) Powerful pattern for string-based templating.
String formatting