**regexcapture.d**
```
import std.stdio : writeln;
import std.regex : matchAll, regex;
import std.file : read;
void main(){
string input = cast(string)read("sourcecode.d");
foreach(match; matchAll(input,
regex(r"\b([A-Za-z_]\w*)\s*\([^)]*\)\s*", "g"))){
writeln(match.captures()[1]);
}
}
```
**Input(sourcecode.d)**
```
BOOL WaitNamedPipeA(LPCSTR, DWORD);
BOOL WaitNamedPipeW(LPCWSTR, DWORD);
BOOL WinLoadTrustProvider(GUID*);
BOOL WriteFile(HANDLE, PCVOID, DWORD, PDWORD, LPOVERLAPPED);
BOOL WriteFileEx(HANDLE, PCVOID, DWORD, LPOVERLAPPED,
LPOVERLAPPED_COMPLETION_ROUTINE);
BOOL WritePrivateProfileSectionA(LPCSTR, LPCSTR, LPCSTR);
BOOL WritePrivateProfileSectionW(LPCWSTR, LPCWSTR, LPCWSTR);
BOOL WritePrivateProfileStringA(LPCSTR, LPCSTR, LPCSTR,
LPCSTR);
BOOL WritePrivateProfileStringW(LPCWSTR, LPCWSTR, LPCWSTR,
LPCWSTR);
```Note: This small input excerpt was taken from a real source code file: https://github.com/dlang/dmd/blob/master/druntime/src/core/sys/windows/winbase.d#L2069-L2078
**Output** ``` C:\Users\Windows10\Documents\matchtest>rdmd regexcapture.d WaitNamedPipeA WaitNamedPipeW WinLoadTrustProvider WriteFile WriteFileEx WritePrivateProfileSectionA WritePrivateProfileSectionW WritePrivateProfileStringA WritePrivateProfileStringW ``` --- Relevant links: https://dlang.org/phobos/std_regex.html#regex https://dlang.org/phobos/std_regex.html#.RegexMatch.captures https://regexr.com/
