Matches Scheme programs as described by https://small.r7rs.org/attachment/r7rs.pdf

Parses for formulas using glyph, unicode or sub/sup tags for the subscripts. TS script here (with screenshot)

Parses advanced chemical formula out of a paragraph of text

Matches for any element on the periodic table of elements

This matches some pretty complicated SMILES structures, works well for my app.

Matches for a chemical structure in a form similar to CHBF5-.K+. Accounts for every scenario I could think of (hydrates, adducts, ionic bonds, positive/negative charge indicators, etc)

Parses valid CAS numbers

from the lowest common div element, copy the html, and insert as the test string, then export

This regular expression is designed to tokenize XML content by identifying major XML constructs through named capture groups. It detects processing instructions (PI), DTD blocks, CDATA sections, comments, self‑closing tags, opening tags, closing tags, and plain text. It is suitable for building lightweight XML lexers or preprocessing XML before deeper parsing.

This regular expression is designed to tokenize XML content by identifying major XML constructs through named capture groups. It detects processing instructions (PI), DTD blocks, CDATA sections, comments, self‑closing tags, opening tags, closing tags, and plain text. It is suitable for building lightweight XML lexers or preprocessing XML before deeper parsing.

Gute KÄSE

wer den löwen weckt muss auch mit ihm tanzen

Regular expression to match a valid line of text in Halacae, a constructed language by R74n.

Regular expression to match valid words in Halacae, a conlang by R74n.

Regular expression to match valid URLs on R74n websites.

Code

plf HIIILLFFEEE

PLF hiilfe

Isch des Tüff

Wer den Löwen weckt muss auch mit ihm tanzen!

A regex to inspect other regex and match all capture groups

internal structure of a batch name

This is a GitHub Advanced Security (GHAS) Secret Scanning Custom Pattern I created to detect likely hardcoded credentials while reducing common false positives in code. Goal: detect assignments for these key names: password secret apikey / api_key / api-key Pattern regex: (?i)\b(password|secret|api[-]?key)\b\s[:=]\s(?!\s\$\{)(?!\sprocess\.env\b)(?:['"])?[A-Za-z0-9!@#$%^&()+=-]{5,}(?:['"])? What it should catch (examples): password: "ahsjdfahsjfhdjsahj" secret = 'kjfskahfsdhfj' apikey: ABCDE12345!@# (unquoted) What it tries NOT to catch (common false positives): password: ${password_somename} (template/variable placeholder) secret: ${VAULT_SECRET} password: process.env.DB_PASSWORD (env var reference, not a hardcoded secret) This is intended as a practical baseline; it won’t be perfect for every language/config style. If you have suggestions to improve the detection accuracy (reduce false positives/false negatives) for GHAS custom patterns, please share.

Finds CSS selectors that only contain one line and, using the substitution, flattens everything to be on the same line.

Matches and verifies IP address. 192.168.0.1 Matches 999.999.9.9 Didn't match

52 character long regex to validate IP address.

selects numbers, with commas and decimals, like 1,234.56

Grabs the outer parentheses and contents taking into account inner parentheses enclosures

matches composer packages with -alpha, -beta and -rc versionings

Regex showing how to match the five parts in an OmegaT project name (named as per the internal convention at cApStAn), including labels for each captured group (each part in the name).

match: #aabbcc #abc (255,255,255) (255,255,255,255) 255,255,255 no match: #gggggg #ggg 256,256,256

Selects the ` and ` tags from a string. You can probably do this with something easier, but this works

ตรวจสอบพยัญชนะต้น (ต้องมี) ตรวจตัวสะกดสำหรับสระที่ต้องมี ตรวจสอบการวางสระและวรรณยุกต์ไทย หมายเหตุ การตรวจสอบตัวสะกดในภาษาไทยตรวจสอบได้ยากเพราะภาษาไทยเป็นภาษาที่เขียนติด ๆ กันไม่มีการแบ่งคำอย่างชัดเจนทำให้การอ่านภาษาไทยผู้อ่านต้องใช้ความหมายของคำในการตัดสินการอ่านแบ่งคำตามความเหมาะสมเช่นคำว่า "ตากลม" อาจอ่านเป็น "ตาก-ลม" ก็ได้ หรืออ่านเป็น "ตา-กลม"ก็ได้ ดังนั้นการเขียน Regex เพื่อทำการตรวจสอบอาจช่วยได้ระดับหนึ่ง อ่าจมีผิดบ้างถูกบ้าง แต่ก็ถือว่าเป็นเครื่องมือที่ใช้ช่วยเหลือในการตรวจสอบเพิ่มเติมได้ 80% ของความเป็นไปใด้ก็แล้วกันนะครับ หวังว่าการเขียนเพิ่มเติมส่วนนี้ จะมีประโยชน์บ้างไม่มากก็น้อย

This regular expression provides a balance between RFC compliance and security-best-practices. It is designed to prevent injection vectors in legacy systems by using a restricted "safe" character subset recommended by the OWASP Validation Regex Repository. Pattern: ^A-Za-z0-9(?:\.A-Za-z0-9_+&-]+)*@(?:[A-Za-z0-9{0,61}[A-Za-z0-9])?\.)+[A-Za-z]{2,63}$ Key Features: Forced Alphanumeric Start: Prevents leading hyphens to avoid command injection vulnerabilities. Security Subset: Restricts special characters to _+&*- to prevent exotic character injections (e.g., pipes or backticks). No Quoted Strings: Forbids quoted strings to eliminate dangerous payloads containing spaces or backslashes. DNS Compliance: Enforces label lengths (1–63 characters) and prevents labels from starting or ending with hyphens. Whole String Anchoring: Uses ^ and $ to ensure the entire input is validated.

Extracts the following fields from a Laravel Log print: Time Stamp (Date) Log Level (supports optional prefix (ie. local.DEBUG)) Log Message Exception | Context If an exception is detected, the file reference (file path + line number), and optional stacktrace are captured.

Correct Poland PESEL base regex validator. Covers birth dates up to 2099 year. PESEL numbers are in YYMMDDXXXXX format, however, the month is adjusted based on what year people were born. People born from 1900-1999 has no adjustment, 2000-2099 is the month +20, 2100-2199 is +40, 2200-2299 is +60. For example, if someone was born December 16, 2016, their PESEL would be 163216XXXXX.

PLF4

PLF3

PLF2

plf1

hey das ist richtig coool oder?

Simple prefix matcher for validating URI Schemes according to [RFC2396, Section 3.1]( http://www.faqs.org/rfcs/rfc2396.html#3.5:~:text=well%20as%20%22http%22%29.-,scheme%20%20%20%20%20%20%20%20%3D%20alpha%20*%28%20alpha%20%7C%20digit%20%7C%20%22%2B%22%20%7C%20%22%2D%22%20%7C%20%22.%22%20%29,-Relative%20URI%20references) Go Playground: https://go.dev/play/p/vtYEugsNAfo

URL, URI format validation

Used to check Email Format

ตรวจสอบการใช้วรรณยุกต์และสระในภาษาไทย รองรับการใช้สระอาาาาาติดกันแบบลากเสียง ไม่ตรวจสอบพยัญชนะต้นและตัวสะกด

ใช้ตรวจสอบวรรณยุกต์และสระในภาษาไทย ไม่ตรวจสอบพยัญชนะต้นและตัวสะกด

Matches instagram urls for posts, reels, and stories works on all flavors except rust

match every type of discord url with each useful part in a group pretty optimized, shouldnt be too harsh on your system should work in every flavor except rust because rust sucks lol

I've created this for a simple project of mine, it squishes every book of the Bible into a RegEx, with the full name, abbreviation, and abbreviation with a dot. Then, it matches the chapter and verse relatively simply.

Caculator seperator with groups