DEELX Extended Syntax: Non-capture Group

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Non-capture Group (?:xxx)

Use (?: ) to enclose sub-expressions into a single element. It will not capture what it matches.

Remarks

It is different from common group that non-capture group will not capture and record what it matches. So it is more efficient than common group.

Use format (?ismg-ismg:xxx) to change the mode, and the new mode will take effect only in the non-capture group.