The absolute bare minimum every programmer should know about regular expressions - I’m Mike

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The absolute bare minimum every programmer should know about regular expressions
The Line Anchors: ‘^’ and ‘$’
The ‘^’ character is used to anchor the match to the start of the line, so ^mike would only find lines that start with mike. Similarly, the expression mike$ would only find m - i - k - e at the end of a line (but would still match ‘carmike’).
The Character Class: ‘[]‘
The regular expression gr[ea]y is interpreted as “g, followed by r, followed by either an e or an a, followed by y.”
If you use [^ ... ] instead of [ ... ], the class matches any character that isn’t listed.
The Character Class Metacharacter: ‘-’
Instead of [01234567890abcdefABCDEF] we can write [0-9a-fA-F]
Matching Any Character With a Dot: ‘.’
The ‘.’ metacharacter (called a dot or point) is shorthand for a character class that matches any character.
The Alternation Metacharacter: ‘|’
For example, Mike and Michael are separate expressions, but Mike|Michael is one expression that matches either.
The expression Mi(ke|chael) matches the same thing.
Matching Optional Items: ‘?’
If I wanted to match the english or american versions of the word ‘flavor’ I could use the regex flavou?r
The Other Quantifiers: ‘+’ and ‘*’
I might use the regular expression go+al, which would match ‘goal’, as well as ‘gooooooooooooooooal’ (but not ‘gal’).
The Interval Quantifier: ‘{}’
The regex go{1,5}al would limit our previous example to matching between one and five o’s. The sequence {0,1} is identical to a question mark.
The Escape Character: ‘\’
if you would like to match the ‘?’ or ‘\’ characters, you can precede them with a backslash, which removes their meaning: ‘\?’ or ‘\\’.
Using Parenthesis for Matching: ‘()’
I could match the domain portion of a URL by using an expression like http://([^/]+).

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"Regular expressions are strings formatted using a special pattern notation that allow you to describe and parse text. Many programmers (even some good ones) disregard regular expressions as line noise, and it’s a damned shame because they come in handy s

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