Extracting ID from multiple strings formats using strsplit [R Tips & Tricks]

I needed to extract an ID across multiple formats and different datasets, where the possible patterns are:

ID-xx-yy, ID-xx, ID

For example:

00018523-01-02, 078-11, 789522314H

strsplit did the work:

strsplit("00018523-01-02","-")[[1]][1]
## [1] "00018523"
strsplit("078-11","-")[[1]][1]
## [1] "078"
strsplit("789522314H","-")[[1]][1]
## [1] "789522314H"

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