The question mark (?) is a quantifier in regular expressions that indicates that the preceding element should be matched zero or one time. It allows you to specify that the element is optional, meaning it may occur once or not at all. For example, ab?c will be matched for the string a...
Before you move on, you might want to play with the previous code example a little to really let the meaning of it sink in. I still remember this taking me a while to wrap my head around. So don’t worry about spending a few minutes in an interpreter session on this. It’ll be w...
\ -- inhibit the "specialness" of a character. So, for example, use \. to match a period or \\ to match a slash. If you are unsure if a character has special meaning, such as '@', you can put a slash in front of it, \@, to make sure it is treated just as a character....
^ has no special meaning if it’s not the first character in the set. To match a literal ']' inside a set, precede it with a backslash, or place it at the beginning of the set. For example, both [()[\]{}] and []()[{}] will both match a parenthesis. | A|B, where A ...
overlay_intersects('L1',@id,return_details:=true)(on L2) returns[ { 'id': 1, 'overlap': 4, 'radius': 1, 'result': 1 } ]: the returned overlap value is 4 units (only the area of the biggest part) while in my opinion it should be 5 units (the total area). ...
Before you move on, you might want to play with the previous code example a little to really let the meaning of it sink in. I still remember this taking me a while to wrap my head around. So don’t worry about spending a few minutes in an interpreter session on this. It’ll be ...
Python code and SQLite3 won't INSERT data in table Pycharm? What am I doing wrong here? It run's without error, it has created table, but rows are empty. Why? Ok so I found why it didn't INSERT data into table. data in sql = string didnt have good formating ( ......
Meaning of TextQualified attribute in flat file connections Merge join not able to join properly on varchar column Merge Join produces wrong results when inputs are sorted with order by in the query Merge Join running for Long time in SSIS meta data in ssis Metadata could not be dertermined...
For example, supposing that we want to find lines that contain comments in Python files, we might try searching for #* . But this regex will match any line whatsoever, including blank lines because the meaning is “match any number of #s”—and that includes none. As a rule of thumb ...
【语法BUG】Variable used in lambda expression should be final or effectively final lambdaexpressionshouldbefinaloreffectivelyfinal二、错误译文:lambda表达式中使用的变量应该是final或有效的final三、错误来源: 3.1、Lambda内外部使用变量异常 注意:虽然此处是Lambda表达式使用变量应该是final,但其实在线程中也会出现该...