The engine then enters the capturing group. This is easy to understand if we look at how the regex engine applies ! ( abc | 123 ) + ! to !abc123!. When it matches !123abcabc!, it only stores abc. When this regex matches !abc123!, the capturing group stores only 123.
However, it no longer meets our requirement to capture the tag’s label into the capturing group.
This regular expression will indeed match these tags. The quick and easy solution is ! ( abc | 123 ) + !. Now let’s say that the tag can contain multiple sequences of abc and 123, like !abc123! or !123abcabc!. That’s easy enough: ! ( abc | 123 ) ! will do the trick. Only these two are possible, and you want to capture the abc or 123 to figure out which tag you got. Let’s say you want to match a tag like !abc! or !123!.
The difference is that the repeated capturing group will capture only the last iteration, while a group capturing another group that’s repeated will capture all iterations. When creating a regular expression that needs a capturing group to grab part of the text matched, a common mistake is to repeat the capturing group instead of capturing a repeated group.
0 kommentar(er)
