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  1. #include <stdio.h>
  2. #include <regex.h>
  3.  
  4. int main(void) {
  5.  
  6.  
  7. const char *regular_expression_pattern_keyword = "^(auto|break|case|char|const|continue|default|do|double|else|enum|extern|float|for|goto|if|int|long|register|return|short|signed|sizeof|static|struct|switch|typedef|union|unsigned|void|volatile|while)";
  8. const char *regular_expression_pattern_identifier = "^[[:alpha:]]{1,}";
  9. const char *regular_expression_pattern_number = "^[[:digit:]]+(\\W|$)";
  10. const char *regular_expression_pattern_punctuator = "^[[:punct:]]";
  11.  
  12. const char *patterns[] = {
  13.     regular_expression_pattern_keyword,
  14.     regular_expression_pattern_identifier,
  15.     regular_expression_pattern_number,
  16.     regular_expression_pattern_punctuator
  17. };
  18.  
  19. for (int i = 0; i < 4; i++)
  20. {
  21.     regex_t regular_expression;
  22.     int status;
  23.  
  24.     status = regcomp(&regular_expression, patterns[i], REG_EXTENDED);
  25.  
  26.     if (status)
  27.     {
  28.         // FIXME: Improve error handling!
  29.         printf("Error: Failed to compile regex!\n");
  30.         exit(1);
  31.     }
  32.  
  33.     status = regexec(&regular_expression, "12 abc", 0, NULL, 0);
  34.  
  35.     if (!status)
  36.     {
  37.         printf("Regex status: Match ->%s\n", patterns[i]);
  38.     }
  39.  
  40.     else if (status == REG_NOMATCH)
  41.     {
  42.         printf("Regex status: No match\n");
  43.     }
  44.  
  45.     else
  46.     {
  47.         // FIXME: Improve error handling!
  48.         printf("Error: Failed to match regex!\n");
  49.         exit(1);
  50.     }
  51.  
  52.     regfree(&regular_expression);
  53. }
  54.  
  55. 	return 0;
  56. }
  57.  
Success #stdin #stdout 0s 2292KB
comments (?)
stdin 
Standard input is empty
stdout 
Regex status: No match
Regex status: No match
Regex status: Match ->^[[:digit:]]+(\W|$)
Regex status: No match
https://ideone.com/vCdjG9
language:
C (gcc 8.3)
created:
10 years ago
visibility:
secret

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