Extracting a string between two characters - Matlab (regexp)

Question

I'm needing to extract a string of 3 numbers between a beginning character and a possibility of three different ending characters. Staring with _a and ending with either _b, _c or _d. I know how to do it with strfind but really want to know how to use regexp.

For example string could be:

ggggga_a123_cggggg

or/

gggggg_a345_bggggg

or/

gggggg_a456_dggggg

How do I just extract the three numbers without knowing which ending character it will be. Thanks

I just did regexp(s,'(?<=_a).*(?=b_|c_|d_)','match'); Should this work for all instances? — Darius Andreas
– Darius Andreas, Commented Sep 3, 2016 at 4:01
That's incorrect. You need this: regexp(s,'(?<=_a).*(?=_b|_c|_d)','match') — Sardar Usama
– Sardar Usama, Commented Sep 3, 2016 at 4:12

Sebastian Lenartowicz · Accepted Answer · 2016-09-03 05:12:22Z

1

I'd go with a regex like this:

_a(\d{3})_[bcd]

What this will do is match the starting _a, match the 3 digits in a capture group (the ()) for extraction, then match the second underscore and one of b, c, or d.

answered Sep 3, 2016 at 5:12

Sebastian Lenartowicz

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