The Complete Regular Expressions(Regex) Course For Beginners

Explore the POSIX basic set of regular expression symbols through examples and hands-on sessions, studying each symbol thoroughly and moving on to the remaining basics in the next module.

The lecture demonstrates using the dot wildcard in regex to match exactly one character between fixed prefixes foo and bar, forming the pattern foo...bar and validating it with grep.

Explore using the dot star wildcard to match any middle content between fixed foo and bar, forming a single regex pattern and testing with grep.

Represent whitespaces in regex by using the \s symbol with * to match zero or more spaces between foo and bar, demonstrated via a grep test against an input file.

Learn how character classes in regex use square brackets to match specific letters, build differentiators between strings, and use negation to exclude patterns, including 'oo' endings.

Apply character class ranges to differentiate green and red strings ending in oo, using j-m, union with z, and two-range patterns, then test with grep.

Learn to escape regex metacharacters with a backslash to treat symbols like the period as literals, and build patterns such as x*\.y* or character classes to match x and y.

Discover how regex anchors enforce line boundaries using the caret and dollar, enabling patterns that begin with foo, end with bar, or match only foo.

Explore the POSIX-based regular expressions extended set, building on the basic set, and learn symbol-by-symbol meanings through examples and hands-on sessions.

Identify 3-digit numbers using a digit class [0-9] repeated 3 times with start and end anchors, then apply the curly braces repeater for exact or ranged repetitions, ensuring whole-string matches.

Learn to use the curly braces repeater on grouped ha patterns in extended regex, enforcing at least four repetitions with parentheses and validating whole strings with anchors.

Learn to build a regex that matches strings starting with 'foo' and ending with 'bar' with one or more 'a's in between, using the plus quantifier and grep.

Learn to use the question mark quantifier to represent zero or one repetition in a regex that matches http or https website urls by adding an optional s.

Master the pipe to create alternatives in regular expressions, building a pattern like (log|ply)wood to match logwood or plywood.

Learn to use regex to perform find and replace operations, define capture groups, craft substitution strings, and apply replacements with a regex engine through practical examples.

Explore capturing numbers from monitor resolutions with regex and reformat them, for example 1280x720 to 1280 pix by 720 pix. Learn capture groups and references in sed and Java.

Learn how to use regex capture groups to reformat names from 'first name last name' to 'last name, first name', with practical examples, substitutions, and command-line demonstrations.

Learn to extract hour and minute from clock time with regex and rewrite it as 'minutes past hour' using capture groups and backreferences. Example: 7:32 becomes 32 minutes past 7.

Master masking 10-digit phone numbers with regex by capturing the last four digits and replacing the first six with x, using a backreference like \1 in the substitution.

Transform 3-letter month date strings with regular expressions by capturing the month, date, and year digits, then reformat them into a day-month-yy pattern using capture groups and a replacement string.

Learn regex techniques to transform phone numbers using capture groups and replacement patterns, including literal escapes and sed substitutions, in the complete regex course for beginners.

Hone your regex skills with a challenges section that starts with one problem and adds more, offering solutions for some and inviting you to submit answers for feedback and hints.

Learn regex-based email validation, covering the local-part, at symbol, and domain rules like dot with two letters. Build a regex that yields match for valid emails and no-match for invalid.

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the complete regular expressions course for beginners introduces you to regex concepts and techniques essential for mastering string patterns.