difference between two regular expressions: [abc]+ and ([abc])+

Question

In [29]: re.findall(\"([abc])+\",\"abc\")
Out[29]: [\'c\']

In [30]: re.findall(\"[abc]+\",\"abc\")
Out[30]: [\'abc\']

Confused by the grouped one.

Answer 1

In the first example you have a repeated captured group which only capture the last iteration. Here c.

([abc])+

Debuggex Demo

In the second example you are matching a single character in the list one and unlimited times.

[abc]+

Debuggex Demo