Enhances CLI help output with color and formatting

Improves the readability and visual appeal of the CLI help message by adding color-coded elements for better clarity.

This change introduces color to distinguish between different sections and options, making the help message easier to understand and navigate for users. It uses constants for colors.

Author: yoeunes

bin/regex

@@ -74,26 +74,35 @@ function output(string $text): void
 
 function showHelp(): void
 {
-    output(bold("Regex Parser CLI Tool") . "\n\n");
-    output("Usage: regex <command> [options] <pattern>\n\n");
-    output(bold("Commands:\n"));
-    output("  " . info("parse") . " <pattern> [--validate]    Parse and recompile a regex pattern\n");
-    output("  " . info("analyze") . " <pattern>               Analyze a regex (parse, validate, ReDoS, explain)\n");
-    output("  " . info("highlight") . " <pattern> [--format=auto|cli|html]  Highlight regex for display\n");
-    output("  " . info("validate") . " <pattern>              Validate a regex pattern\n");
-    output("  " . info("help") . "                            Show this help\n\n");
-    output(bold("Global Options:\n"));
-    output("  --ansi          Force ANSI output\n");
-    output("  --no-ansi       Disable ANSI output\n");
-    output("  -q, --quiet     Suppress output\n");
-    output("  --silent        Same as --quiet\n");
-    output("  --help          Show this help\n\n");
-    output(bold("Examples:\n"));
-    output("  regex parse '/a+/'\n");
-    output("  regex analyze '/a+/'\n");
-    output("  regex highlight '/a+/' --format=cli\n");
-    output("  regex validate '/a+/'\n");
-    output("  regex '/a+/'  # Shortcut for highlight\n");
+    output(color("Regex Parser", CYAN) . "\n");
+    output(color(str_repeat("=", 12), CYAN) . "\n\n");
+
+    output(color("Description:", MAGENTA) . "\n");
+    output("  " . bold("A beautiful CLI tool for regex parsing, validation, and analysis") . "\n\n");
+
+    output(color("Usage:", MAGENTA) . "\n");
+    output("  regex " . color("<command>", YELLOW) . " " . color("[options]", CYAN) . " " . color("<pattern>", GREEN) . "\n\n");
+
+    output(color("Commands:", MAGENTA) . "\n");
+    output("  " . info("parse") . "     Parse and recompile a regex pattern\n");
+    output("  " . info("analyze") . "   Analyze a regex (parse, validate, ReDoS, explain)\n");
+    output("  " . info("highlight") . " Highlight regex for display\n");
+    output("  " . info("validate") . "  Validate a regex pattern\n");
+    output("  " . info("help") . "      Display this help message\n\n");
+
+    output(color("Global Options:", MAGENTA) . "\n");
+    output("  " . color("--ansi", CYAN) . "          Force ANSI output\n");
+    output("  " . color("--no-ansi", CYAN) . "       Disable ANSI output\n");
+    output("  " . color("-q, --quiet", CYAN) . "     Suppress output\n");
+    output("  " . color("--silent", CYAN) . "        Same as --quiet\n");
+    output("  " . color("--help", CYAN) . "          Display this help message\n\n");
+
+    output(color("Examples:", MAGENTA) . "\n");
+    output("  " . color("regex", BLUE) . " " . color("'/a+'", GREEN) . "                           # Quick highlight\n");
+    output("  " . color("regex", BLUE) . " " . color("parse", YELLOW) . " " . color("'/a+'", GREEN) . " " . color("--validate", CYAN) . "          # Parse with validation\n");
+    output("  " . color("regex", BLUE) . " " . color("analyze", YELLOW) . " " . color("'/a+'", GREEN) . "                   # Full analysis\n");
+    output("  " . color("regex", BLUE) . " " . color("highlight", YELLOW) . " " . color("'/a+'", GREEN) . " " . color("--format=html", CYAN) . "   # HTML highlight\n");
+    output("  " . color("regex", BLUE) . " " . color("validate", YELLOW) . " " . color("'/a+'", GREEN) . "                  # Quick validation\n");
 }
 
 // Remove processed options from argv