What does ?= mean in a regular expression?
6448
Reference - What does this regex mean?
109567
How does operator  work when comparing two strings?
10125
How does this regular expression work?
29914
What is the difference between  and ?
1978
What to do Regular expression pattern doesn't match anywhere in string?
86355
?: ternary conditional operator behaviour when leaving one expression empty
748
What do 'lazy' and 'greedy' mean in the context of regular expressions?
23269
What is the ?: operator
57007
What is the meaning of $? in a shell script?
19592
What does ||= (or-equals) mean in Ruby?
103008
What does !$ mean?
92087
What does =* mean?
46974
What's the meaning of a number after a backslash in a regular expression?
32886
What is the difference between != and =! in Java?
68737
Is there a VB.NET equivalent for C#'s '??' operator?
22122
How do you use the ? : (conditional) operator in JavaScript?
126174
What is the difference between != and  operators?