regex


Matching regular expression only at beginning of line in MATLAB


I have a string that spans multiple lines. The line breaks are LF, as in this example of "hello world" that has a line break between "hello" and "world":
some_bytes = [104 101 108 108 111 10 119 111 114 108 100];
some_string = char(some_bytes);
disp(some_string)
I want to match the sequence "wo", but only if it occurs at the beginning of a line. But using the regular expression
idx = regexpi(some_string,'^wo');
returns an empty array. What am I doing wrong?
^, by default, matches only at the beginning of the string. You can activate multiline mode by using the (?m) search flag:
idx = regexpi(some_string,'(?m)^wo');
Alternatively, you can supply the option 'lineanchors'. See the documentation.

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