Regular expressions: Difference between revisions
Alternative C solution
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return 0;
}</lang>
===Alternative using GLib===
The task is a bit easier with GLib's Perl-compatible regular expression functionality.
{{libheader|GLib}}
<lang c>#include <stdio.h>
#include <glib.h>
void print_regex_match(const GRegex* regex, const char* string) {
GMatchInfo* match_info;
gboolean match = g_regex_match(regex, string, 0, &match_info);
printf(" string = '%s': %s\n", string, match ? "yes" : "no");
g_match_info_free(match_info);
}
void regex_match_demo() {
const char* pattern = "^[a-z]+$";
GError* error = NULL;
GRegex* regex = g_regex_new(pattern, 0, 0, &error);
if (regex == NULL) {
fprintf(stderr, "%s\n", error->message);
g_error_free(error);
return;
}
printf("Does the string match the pattern '%s'?\n", pattern);
print_regex_match(regex, "test");
print_regex_match(regex, "Test");
g_regex_unref(regex);
}
void regex_replace_demo() {
const char* pattern = "[0-9]";
const char* input = "Test2";
const char* replace = "X";
GError* error = NULL;
GRegex* regex = g_regex_new(pattern, 0, 0, &error);
if (regex == NULL) {
fprintf(stderr, "%s\n", error->message);
g_error_free(error);
return;
}
char* result = g_regex_replace_literal(regex, input, -1,
0, replace, 0, &error);
if (result == NULL) {
fprintf(stderr, "%s\n", error->message);
g_error_free(error);
} else {
printf("Replace pattern '%s' in string '%s' by '%s': '%s'\n",
pattern, input, replace, result);
g_free(result);
}
g_regex_unref(regex);
}
int main() {
regex_match_demo();
regex_replace_demo();
return 0;
}</lang>
{{out}}
<pre>
Does the string match the pattern '^[a-z]+$'?
string = 'test': yes
string = 'Test': no
Replace pattern '[0-9]' in string 'Test2' by 'X': 'TestX'
</pre>
=={{header|C sharp}}==
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