What's the difference between regex [-+]? and (-|+)?
118699
Using alternation or character class for single character matching?
91346
What's different between Python and Javascript regular expressions?
47446
Differences between Javascript regexp literal and constructor
111925
What's the difference between !, %, and @ in replacement tokens?
98459
What are the differences between "-" and "--" in commands?
76336
String formatting: % vs. .format vs. string literal
146486
Why isn't [ -n ] false like [ -n "" ]?
21903
What is the difference between [0-9]+ and [0-9]++?
83053
Difference between [square brackets] and *asterisk
25358
What is the differences between &> and 2>&1
66160
Math operations in regex
94785
What are :+ and &:+ in Ruby?
120214
What's the difference between <<, <<< and < < in bash?
82369
What does #{...} mean?
6276
Difference between \xx{} and \mathxx{}?
111616
Why avoid increment ("++") and decrement ("--") operators in JavaScript?
125564
PHP regex delimiter, what's the point?