CODEWITHSUNDEEP
awk
Tedee12345
Tedee12345

Reputation: 1210

Awk - regular expression

I have two examples:

1.

$ echo "Lorem ipsum dolor sit amet" | awk '{gsub(/L[^r]r/,""); print}'

em ipsum dolor sit amet

2.

$ echo "Loorem ipsum dolor sit amet" | awk '{gsub(/L[^r]r/,""); print}'

Loorem ipsum dolor sit amet

Why the second example does not work the same as the first?

In the first example, the record of [^r] is treated as a single character? Is it because one "o" is deleted?

Upvotes: 2

Views: 589

Answers (1)

Chris Seymour
Chris Seymour

Reputation: 85765

L[^r]r matches L followed by any single character that isn't r followed by r like Lor. To match Loor you would want L[^r]+r. The + quantifier means one or more characters that are not r.

$ echo "Loorem ipsum dolor sit amet" | awk '{gsub(/L[^r]+r/,""); print}'
em ipsum dolor sit amet

Upvotes: 5

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