Research on pattern matching in Linux

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// Match the input mode with the string to be matched. If the input mode is successful, 0 is returned;
// Pattern: Mode
// Buf: the string to be matched;
Int Regexp (char * pattern, char * BUF)

{
Regex_t reg;
Int status = 0;
Int cflags = reg_extended | reg_nosub;
Char error [32];

/* Compile a regular expression */
Status = regcomp (, pattern, cflags );
If (status! = 0)
{
Regerror (status, error, sizeof (error ));
Printf ("regcomp error-> % s: Pattern '% s' \ n", pattern, error );
Return-1;
}

// Match
Status = regexec (, Buf, 0, null, 0 );
If (status! = 0)
{
If (status! = Reg_nomatch)
{
Regerror (status, error, sizeof (error ));
Printf ("regexec-> non reg_nomatch-> error-> Status = % d: '\ n", error );
Status =-2;
}
Else if (status = reg_nomatch)
{
Printf ("regexec-> reg_nomatch-> error-> Status = % d: '\ n", error );
Status =-3;
}
}
Else
{
Printf ("regexec-> reg_nomatch-> success-> pattern = % s, Buf = % s \ n", pattern, Buf );
Status = 0;
}

/* Output the processing result */
// Output matching results if necessary;

/* Release the regular expression */
Regfree ();

// Return the processing result;
Return status;

}

/* Main Program */

Int main (INT argc, char ** argv)

{
// Char * pattern = "^ [0-9] * [1-9] [0-9] * $ ";
Char * pattern = "^ [0-9] + $ ";
// Char * pattern = "^ \ D + $ ";
Char * Buf = "00000 ";

Int A = Regexp (pattern, Buf );
Printf ("Main-> Info-> A = % d \ n", );
}
Note: Regular Expression control is not supported.

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