grep - Why does this regex not work for matching C integer declarations? -


i'm using following regular expression match c integer declarations without initialization. integer might unsigned:

^(unsigned[[:space:]]+|^$)int[[:space:]]+[a-za-z0-9_]+;$

the first part matches unsigned followed number of spaces, or nothing. second part matches int followed spaces, plus variable name , semicolon.

unfortunately, seems not match integer declaration doesn't have unsigned in it. doing wrong? ^$ in (...|...) pattern expect (match empty string)? google , regex manual isn't helping.

try this:

^[[:space:]]*(unsigned[[:space:]]+)?int[[:space:]]+[a-za-z0-9_]+;[[:space:]]*$

to make group optional, put ? after it. ^$ doesn't match empty string in middle of match, matches entirely empty string -- ^ matches beginning of string, , $ matches end of string.


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