Regular Expressions (Regex) for the Absolute Beginner!

Walkthrough teaching regex basics: use square brackets to build character classes, constrain the first character to M, m, or S, and match Hadoop or Madobe while excluding other options.

This walkthrough shows building a regular expression to match everything except a specific starting character by using a complement inside square brackets with a caret.

Navigate challenge 3 walkthrough by building a regular expression that matches words at the start of a sentence using the carrot character, and identify which groups match.

Complete the regex challenge 4 walkthrough by identifying groups, matching full words, and using an end-of-sentence marker to isolate adverbs at sentence endings.

Learn to match adults that start with k or g using regular expressions, first with a square-bracket character class, then with parentheses and a pipe for alternation.

Explains building regex to match adjacent groups, using square brackets and grouping, then applying repetition with curly braces, and comparing round brackets with a pipe for the same matches.

Match the bird at the start of the sentence and the birds at the end using the carrot sign, the dollar sign, and the pipe, with round brackets for grouping.

Practice a regex walkthrough that matches the word bird at the start of a sentence using a caret, grouping, and {2,4} repetition to count two to four occurrences.

Walks through matching bird repeated two to four times from the start to the end of a sentence using the caret start, end anchor, and the {2,4} quantifier.

Master a walkthrough for matching country names inside curly brackets using a regex pattern, including escaping braces and using dot star to capture lines.

Walkthrough of challenge 11 demonstrates matching lines with curly bracketed country names and a single code, using escapes for quotes to prevent issues in Python and Java.

Match countries enclosed in single or double quotes with a regex, using escapes, grouping, and the pipe operator, to cover line starts, ends, and curly brackets.

Write and combine two regular expressions using a pipe to match country codes in single or double forms inside curly braces, then capture the country in square brackets.

Explore building a regular expression to match email addresses in real-world data, covering the first part before the at symbol, the domain with dots, hyphens, escaping dots, and repetition rules.

Develop a regex to match IP addresses by building a digit component of one to three digits, escaping dots, and repeating the pattern three times before a final digit block.

Learn to write a regex to match bitcoin addresses by defining a 34-character pattern starting with 1, using a character class for letters and digits, and repeating 33 times.

This lecture walkthrough demonstrates constructing a regex to match URL addresses, starting with http(s):// and using a character class and plus repetition to cover path and query characters.

This walkthrough demonstrates extracting the user agent value from JSON-like text by crafting a regex to capture the text between the user agent and country keys, with escaped quotes.

Learn to extract postal code values from xml with a regex that matches the opening and closing tags and captures 1–15 chars from digits, uppercase letters, hyphens, and spaces.

Formulate your own regular expressions to match any pattern. Post questions in the Q&A for help, and read the scores while providing valuable feedback to improve the scores.

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