Fix PostgreSQL regex check constraint misinterpretation as enum

[Copilot]

Problem

PostgreSQL regex-based check constraints using the ~ operator were incorrectly converted to enum columns during migration generation.

Example:

• Original constraint: (parent_id IS NULL) OR ((parent_id)::text ~ '^O\.[0-9]+$'::text)
• Wrong migration: $table->enum('parent_id', ['^O\.[0-9]+$'])->nullable()
• Should generate: $table->string('parent_id')->nullable()

This caused the generated migration to create a literal enum constraint (parent_id IS NULL) OR ((parent_id)::text = '^O\.[0-9]+$'::text) instead of preserving the regex pattern matching.

Root Cause

The getEnumPresetValues() method in PgSQLColumn.php blindly extracted any text between single quotes from check constraint definitions, assuming all check constraints with quoted values were enum-style constraints.

Solution

• Added isRegexConstraint() method to detect PostgreSQL regex operators (~, ~*, !~, !~*)
• Modified getEnumPresetValues() to return empty array when regex operators are detected
• This prevents regex constraints from being converted to enum columns while preserving legitimate enum constraint functionality

Testing

✅ Original issue: Regex constraint correctly remains as string column
✅ All PostgreSQL regex operators: ~, ~*, !~, !~* properly detected
✅ Enum constraints: Legitimate enum constraints continue working
✅ No regressions: Existing functionality preserved

// This will now correctly remain a string column:
// (parent_id IS NULL) OR ((parent_id)::text ~ '^O\.[0-9]+$'::text)
$table->string('parent_id')->nullable();

// While this still works as an enum:
// ((status)::text = ANY ((ARRAY['pending'::character varying, 'active'::character varying])::text[]))
$table->enum('status', ['pending', 'active']);

Fixes #276.

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