Tools.h++ Manual

104011 Tandem Computers Incorporated 5-5
5
5.4 Pattern matching
Class RWCString supports a convenient interface for string searches. Here is
an example. The code fragment:
RWCString s("curiouser and curiouser.");
int i = s.index("curious");
will find the start of the first occurrence of " curious " in s . The comparison
will be case sensitive. The result is that i will be set to “0”. To find the index
of the next occurrence use:
i = s.index("curious", ++i);
which will result in i being set to “14”. To make a case-insensitive comparison
use:
RWCString s("Curiouser and curiouser.");
int i = s.index("curious", 0, RWCString::ignoreCase);
which will also result in i being set to “0”.
If the pattern does not occur in the string, then index() will return the special
value RW_NPOS .
Regular expressions
The Tools.h++ Class Library supports regular expression searches. See Part 2:
Class Reference, under RWCRegexp , for details of the regular expression syntax.
A regular expression can be used to return a substring. Here's an example that
might be used to match all Windows messages (prefix of WM_ ):
#include <rw/cstring.h>
#include <rw/regexp.h>
#include <rw/rstream.h>
main()
{
RWCString a("A message named WM_CREATE");
// Construct a Regular Expression to match Windows messages:
RWCRegexp re("WM_[A-Z]*");
cout << a(re) << endl;