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AP1403 - RegEx
AP1403 - RegEx
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First Assignment - RegEx

Enough of algorithms! Let's dive into a practical development tool called RegEx (Regular Expressions).

What is RegEx?

RegEx is short for Regular Expressions. It is used to detect or validate specific patterns within a string, helping us find substrings that match a desired format.

Imagine developing a website and designing a sign-up page. You’ll want to check whether the email entered by the user is valid. What about the password? Or perhaps you need to scan all incoming traffic to detect profanity or sensitive information?

With RegEx, all of this becomes easy and efficient! It saves developers time and improves performance by eliminating unnecessary conditional checks.

RegEx Cat

Getting Started

Now that you know the power of RegEx, let's begin!

Follow the same structured approach as in the previous assignments:

  1. Research and learn about regular expressions, their syntax, and formats.
  2. Complete the code by following the provided descriptions.
  3. Pass all tests in the test/java folder.
  4. Add your mentor as a collaborator to your repo so they can review your work.

Notes

  • Each method in Exercises.java has a different return type, so be mindful of your implementation.
  • RegEx syntax can vary across different engines—make sure to learn how Java's RegEx works specifically.

Resources


Good luck, and happy coding!

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A practical challenge to get familiar with AP and Regular Expressions

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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First Assignment - RegEx
Enough of algorithms! Let's dive into a practical development tool called RegEx (Regular Expressions).
What is RegEx?
RegEx is short for Regular Expressions. It is used to detect or validate specific patterns within a string, helping us find substrings that match a desired format.
Imagine developing a website and designing a sign-up page. You’ll want to check whether the email entered by the user is valid. What about the password?
Or perhaps you need to scan all incoming traffic to detect profanity or sensitive information?
With RegEx, all of this becomes easy and efficient! It saves developers time and improves performance by eliminating unnecessary conditional checks.

RegEx Cat
Getting Started
Now that you know the power of RegEx, let's begin!
Follow the same structured approach as in the previous assignments:
  1. Research and learn about regular expressions, their syntax, and formats.
  2. Complete the code by following the provided descriptions.
  3. Pass all tests in the test/java folder.
  4. Add your mentor as a collaborator to your repo so they can review your work.
Notes
  • Each method in Exercises.java has a different return type, so be mindful of your implementation.
  • RegEx syntax can vary across different engines—make sure to learn how Java's RegEx works specifically.
Resources


Good luck, and happy coding!

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A practical challenge to get familiar with AP and Regular Expressions
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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First Assignment - RegEx
Enough of algorithms! Let's dive into a practical development tool called RegEx (Regular Expressions).
What is RegEx?
RegEx is short for Regular Expressions. It is used to detect or validate specific patterns within a string, helping us find substrings that match a desired format.
Imagine developing a website and designing a sign-up page. You’ll want to check whether the email entered by the user is valid. What about the password?
Or perhaps you need to scan all incoming traffic to detect profanity or sensitive information?
With RegEx, all of this becomes easy and efficient! It saves developers time and improves performance by eliminating unnecessary conditional checks.

RegEx Cat
Getting Started
Now that you know the power of RegEx, let's begin!
Follow the same structured approach as in the previous assignments:
  1. Research and learn about regular expressions, their syntax, and formats.
  2. Complete the code by following the provided descriptions.
  3. Pass all tests in the test/java folder.
  4. Add your mentor as a collaborator to your repo so they can review your work.
Notes
  • Each method in Exercises.java has a different return type, so be mindful of your implementation.
  • RegEx syntax can vary across different engines—make sure to learn how Java's RegEx works specifically.
Resources


Good luck, and happy coding!

About
A practical challenge to get familiar with AP and Regular Expressions
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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First Assignment - RegEx
Enough of algorithms! Let's dive into a practical development tool called RegEx (Regular Expressions).
What is RegEx?
RegEx is short for Regular Expressions. It is used to detect or validate specific patterns within a string, helping us find substrings that match a desired format.
Imagine developing a website and designing a sign-up page. You’ll want to check whether the email entered by the user is valid. What about the password?
Or perhaps you need to scan all incoming traffic to detect profanity or sensitive information?
With RegEx, all of this becomes easy and efficient! It saves developers time and improves performance by eliminating unnecessary conditional checks.

RegEx Cat
Getting Started
Now that you know the power of RegEx, let's begin!
Follow the same structured approach as in the previous assignments:
  1. Research and learn about regular expressions, their syntax, and formats.
  2. Complete the code by following the provided descriptions.
  3. Pass all tests in the test/java folder.
  4. Add your mentor as a collaborator to your repo so they can review your work.
Notes
  • Each method in Exercises.java has a different return type, so be mindful of your implementation.
  • RegEx syntax can vary across different engines—make sure to learn how Java's RegEx works specifically.
Resources


Good luck, and happy coding!

About
A practical challenge to get familiar with AP and Regular Expressions
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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AP1403 - RegEx
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First Assignment - RegEx
Enough of algorithms! Let's dive into a practical development tool called RegEx (Regular Expressions).
What is RegEx?
RegEx is short for Regular Expressions. It is used to detect or validate specific patterns within a string, helping us find substrings that match a desired format.
Imagine developing a website and designing a sign-up page. You’ll want to check whether the email entered by the user is valid. What about the password?
Or perhaps you need to scan all incoming traffic to detect profanity or sensitive information?
With RegEx, all of this becomes easy and efficient! It saves developers time and improves performance by eliminating unnecessary conditional checks.

RegEx Cat
Getting Started
Now that you know the power of RegEx, let's begin!
Follow the same structured approach as in the previous assignments:
  1. Research and learn about regular expressions, their syntax, and formats.
  2. Complete the code by following the provided descriptions.
  3. Pass all tests in the test/java folder.
  4. Add your mentor as a collaborator to your repo so they can review your work.
Notes
  • Each method in Exercises.java has a different return type, so be mindful of your implementation.
  • RegEx syntax can vary across different engines—make sure to learn how Java's RegEx works specifically.
Resources


Good luck, and happy coding!

About
A practical challenge to get familiar with AP and Regular Expressions
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Activity
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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First Assignment - RegEx
Enough of algorithms! Let's dive into a practical development tool called RegEx (Regular Expressions).
What is RegEx?
RegEx is short for Regular Expressions. It is used to detect or validate specific patterns within a string, helping us find substrings that match a desired format.
Imagine developing a website and designing a sign-up page. You’ll want to check whether the email entered by the user is valid. What about the password?
Or perhaps you need to scan all incoming traffic to detect profanity or sensitive information?
With RegEx, all of this becomes easy and efficient! It saves developers time and improves performance by eliminating unnecessary conditional checks.

RegEx Cat
Getting Started
Now that you know the power of RegEx, let's begin!
Follow the same structured approach as in the previous assignments:
  1. Research and learn about regular expressions, their syntax, and formats.
  2. Complete the code by following the provided descriptions.
  3. Pass all tests in the test/java folder.
  4. Add your mentor as a collaborator to your repo so they can review your work.
Notes
  • Each method in Exercises.java has a different return type, so be mindful of your implementation.
  • RegEx syntax can vary across different engines—make sure to learn how Java's RegEx works specifically.
Resources


Good luck, and happy coding!

About
A practical challenge to get familiar with AP and Regular Expressions
Resources
Readme
Activity
Custom properties
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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First Assignment - RegEx
Enough of algorithms! Let's dive into a practical development tool called RegEx (Regular Expressions).
What is RegEx?
RegEx is short for Regular Expressions. It is used to detect or validate specific patterns within a string, helping us find substrings that match a desired format.
Imagine developing a website and designing a sign-up page. You’ll want to check whether the email entered by the user is valid. What about the password?
Or perhaps you need to scan all incoming traffic to detect profanity or sensitive information?
With RegEx, all of this becomes easy and efficient! It saves developers time and improves performance by eliminating unnecessary conditional checks.

RegEx Cat
Getting Started
Now that you know the power of RegEx, let's begin!
Follow the same structured approach as in the previous assignments:
  1. Research and learn about regular expressions, their syntax, and formats.
  2. Complete the code by following the provided descriptions.
  3. Pass all tests in the test/java folder.
  4. Add your mentor as a collaborator to your repo so they can review your work.
Notes
  • Each method in Exercises.java has a different return type, so be mindful of your implementation.
  • RegEx syntax can vary across different engines—make sure to learn how Java's RegEx works specifically.
Resources


Good luck, and happy coding!

About
A practical challenge to get familiar with AP and Regular Expressions
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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First Assignment - RegEx
Enough of algorithms! Let's dive into a practical development tool called RegEx (Regular Expressions).
What is RegEx?
RegEx is short for Regular Expressions. It is used to detect or validate specific patterns within a string, helping us find substrings that match a desired format.
Imagine developing a website and designing a sign-up page. You’ll want to check whether the email entered by the user is valid. What about the password?
Or perhaps you need to scan all incoming traffic to detect profanity or sensitive information?
With RegEx, all of this becomes easy and efficient! It saves developers time and improves performance by eliminating unnecessary conditional checks.

RegEx Cat
Getting Started
Now that you know the power of RegEx, let's begin!
Follow the same structured approach as in the previous assignments:
  1. Research and learn about regular expressions, their syntax, and formats.
  2. Complete the code by following the provided descriptions.
  3. Pass all tests in the test/java folder.
  4. Add your mentor as a collaborator to your repo so they can review your work.
Notes
  • Each method in Exercises.java has a different return type, so be mindful of your implementation.
  • RegEx syntax can vary across different engines—make sure to learn how Java's RegEx works specifically.
Resources


Good luck, and happy coding!

About
A practical challenge to get familiar with AP and Regular Expressions
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Activity
Custom properties
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