情况1：表达式太复杂。

Case 1: Too complex an expression.

youdao

但是，实践证明对于很长的正则表达式这样太复杂了（很难确定group元素与正则表达式的关系）。

However, this proved too complex with long regexes (it was difficult to decide how the group elements related to the regex).

youdao

但是，实践证明对于很长的正则表达式这样太复杂了（很难确定group元素与正则表达式的关系）。

However, this proved too complex with long regexes (it was difficult to decide how the group elements related to the regex).

youdao