// ═══════════════════════════════════════════════════════
// Regex Tester
// ═══════════════════════════════════════════════════════
function testRegex() {
const pattern = document.getElementById('regexPattern').value;
const flags = document.getElementById('regexFlags').value;
const input = document.getElementById('regexInput').value;
const resEl = document.getElementById('regexResults');
const listEl = document.getElementById('regexMatchList');
if (!pattern || !input) { resEl.innerHTML = 'Enter a pattern and test string...'; listEl.innerHTML=''; return; }
try {
const re = new RegExp(pattern, flags);
// Highlight matches
let highlighted = input.replace(/[<>&]/g, c => ({'<':'<','>':'>','&':'&'}[c]));
const safePattern = new RegExp(pattern, flags);
highlighted = input.replace(safePattern, m => `${m.replace(/[<>&]/g, c => ({'<':'<','>':'>','&':'&'}[c]))}`);
resEl.innerHTML = highlighted || 'No matches';
// Match list
const matches = [...input.matchAll(new RegExp(pattern, flags.includes('g') ? flags : flags + 'g'))];
if (matches.length) {
listEl.innerHTML = 'Matches (' + matches.length + ')
' +
matches.map((m, i) => ``).join('');
} else listEl.innerHTML = '';
} catch (e) {
resEl.innerHTML = `${e.message}`;
listEl.innerHTML = '';
}
}