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cansi-c

c | compare string format

I want to find out if there is any simple option to a string is equal to a format string. for example I want this format .mat[something][something] to be equal to using strcmp to .mat[r1][r2] or .mat[4][5]

Is there any option to use regular expressions of a sort? or something like strcmp(.mat[%s][%s], .mat[r3][r5])?

BTW I'm using ansi-c Thanks

Solution

  • Using the closest thing to regular expression, scanf scan sets, this would work, but it is remarkably ugly:

    char row[20], col[20], bracket[2], ignored;
if (sscanf(input, ".mat[%19[^]]][%19[^]]%1[]]%c", row, col, bracket, &ignored) == 3) {
    // row and col contain the corresponding specifications...    
    // bracket contains "]"
    // %c failed to convert because if the end of string
    ....
}

    Here is the broken down conversion specification for ".mat[r1][r2]":

    ".mat["    // matches .mat[
"%19[^]]"  // matches r1   count=1
"]["       // matches ][
"%19[^]]"  // matches r2   count=2
"%1[]]"    // matches ]    count=3
"%c"       // should not match anything because of the end of string