CODEWITHSUNDEEP
regexmatlab
Some Guy
Some Guy

Reputation: 1797

How do I match a regex pattern multiple times?

I have a log file which I am trying to scan for patterns and count the number of times certain patterns are seen. The log looks like this

11298 [out] [worker:83] data has been rebuilt.

11299 [out] [worker:83] END Building data for foo

11299 [out] [worker:83] END Building data for bar

11300 [out] [worker:83] BEGIN Building data for baz

11301 [err] [worker:83] Putin bombed Syria

I am interested in all the lines starting with [out] and containing END, BEGIN or rebuilt (need to count them separately). So I thought the following regex

(out.*END)*

would match the patch the pattern out] anything here END multiple times, but it only gives me the first instance of out in my file and stops. Can someone point me in the right direction ?

I am doing this in MATLAB with the syntax regexp(txt,expr,'start')

Upvotes: 1

Views: 280

Answers (1)

scope
scope

Reputation: 1997

Here's a doc: http://www.mathworks.com/help/matlab/ref/regexp.html

regexp by default returns all matches.

Try playing with options and outkeys (passed as 3rd argument). It looks like this one could help: 'dotexceptnewline' - your regex is greedy and probably matches whole thing (from first out to last END).

Try using outkey 'match' instead of 'start'.

Also check if your results aren't truncated by mistake.

Upvotes: 2

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