How to Extract Emails and URLs from Text
When working with large batches of marketing copy, server logs, CSV dumps, or messy HTML source code, contact information and web links are often buried in surrounding prose, punctuation, and formatting. This Email & URL Extractor parses unstructured input to isolate valid email addresses and absolute HTTP/HTTPS links into a clean, deduplicated, line-by-line list.
Supported Email Address Scope
The email extraction engine targets standard public Internet email addresses under RFC 5321 dot-atom syntax:
- Length Limits: Complies with RFC 5321 limits of up to 64 octets for the local-part and 255 octets for the full domain name. Addresses with oversized local parts or labels are rejected completely rather than matched partially.
- Dot & Hyphen Rules: Strictly avoids malformed addresses with consecutive dots (
john..doe@example.com), leading dots, or hyphens at the start or end of domain labels. - Domain & TLD Boundaries: Long TLDs supported; no obsolete 2–6 character restriction. Domain labels are validated within standard DNS boundaries (≤63 octets per individual label, ≤255 octets total domain length).
- Mailto Link Parsing: Automatically strips
mailto:protocol prefixes and accompanying query parameters (?subject=...).
Supported Web URL Scope
The URL extractor targets absolute web links embedded in unstructured text and source code:
- HTTP & HTTPS Schemes: Extracts full URLs beginning with
http://orhttps://, including custom port numbers (:8080,:8443). - Query Strings & Fragments: Preserves complex parameters (
?utm_source=test&id=123), encoded characters (%20), and hash routes (#/dashboard). - Balanced Parentheses & Sentence Punctuation: Trims trailing sentence punctuation (periods, commas, colons, brackets) while preserving legitimate balanced parentheses inside URLs, such as Wikipedia articles (
https://en.wikipedia.org/wiki/Page_(disambiguation)). - Safety Limit: Enforces a 4,096-character tool safety/compatibility limit per URL token to ensure stable in-browser processing and prevent token truncation.
- Safe Scheme Filtering: Restricts extraction to standard web protocols and ignores non-web or potentially hazardous pseudo-schemes (
javascript:,data:,file:).
Deduplication & Case Preservation
The extractor maintains data integrity while removing duplicate entries:
- Case-Sensitive Local-Part: Retains the exact casing of the local part of email addresses (
John@example.comvsjohn@example.com) while deduplicating case-insensitive domain variations (@Example.COMvs@example.com). - IDN & URL Canonicalization: Standardizes hostname comparisons (including Unicode IDN and Punycode A-label equivalence) and default ports (80/443) while strictly preserving path and query string case.
- First Occurrence Order: Results are listed in their original sequence of appearance in the text rather than arbitrarily sorted.
Local Browser Processing & Limitations
All processing is performed locally in your web browser using client-side JavaScript. No text is uploaded to our server or stored remotely. Regex patterns are bounded and tested against adversarial inputs. Note that this tool performs syntactic pattern extraction—it does not verify whether an email inbox exists or whether a URL endpoint returns an active 200 HTTP status.