![Subspecies types of Char, and naming cases. [a-z], [A-Z], [0-9], [a-zA-Z], [ a-zA-Z0-9], [A-Z][A-Za-z0-9]*, [a-zA-Z][a-zA-Z0-9]*, and [a-zA-Z_][a-zA-Z0-9_]* : r/haskell Subspecies types of Char, and naming cases. [a-z], [A-Z], [0-9], [a-zA-Z], [ a-zA-Z0-9], [A-Z][A-Za-z0-9]*, [a-zA-Z][a-zA-Z0-9]*, and [a-zA-Z_][a-zA-Z0-9_]* : r/haskell](https://external-preview.redd.it/d7_ndUj679_SVh7MUmcSshMvVV3wEAmGoZnwt-t_OoE.jpg?width=640&crop=smart&auto=webp&s=b0fea74008835e11649f84f9f689749bb6a20ee9)
Subspecies types of Char, and naming cases. [a-z], [A-Z], [0-9], [a-zA-Z], [ a-zA-Z0-9], [A-Z][A-Za-z0-9]*, [a-zA-Z][a-zA-Z0-9]*, and [a-zA-Z_][a-zA-Z0-9_]* : r/haskell
![regex - Why /^[a-zA-Z0-9]+@[a-zA-Z0-9]\.(com)|(edu)|(org)$/i does not work as expected - Stack Overflow regex - Why /^[a-zA-Z0-9]+@[a-zA-Z0-9]\.(com)|(edu)|(org)$/i does not work as expected - Stack Overflow](https://www.debuggex.com/i/-CJQCAkjIU7AYQff.png)
regex - Why /^[a-zA-Z0-9]+@[a-zA-Z0-9]\.(com)|(edu)|(org)$/i does not work as expected - Stack Overflow
![regex - What does it mean ^([a-zA-Z0-9_-]+)$ profile.php?u=$1 an it ^([a-zA- Z0-9_-]+)/$ profile.php?u=$1? - Stack Overflow regex - What does it mean ^([a-zA-Z0-9_-]+)$ profile.php?u=$1 an it ^([a-zA- Z0-9_-]+)/$ profile.php?u=$1? - Stack Overflow](https://i.stack.imgur.com/upHxd.png)