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enhanced index and match

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hyung-hwan
2009-09-17 00:35:29 +00:00
parent 63c12720cb
commit ae7b0a5bdd
9 changed files with 222 additions and 37 deletions
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qse/doc/page/awk.doc
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@ -13,10 +13,10 @@ into an application written in C and/or C++. A hosting application can
- change language features supported by setting options.
The interpreter implements the language described in the book
The AWK Programming Language (http://cm.bell-labs.com/cm/cs/awkbook/) with
The AWK Programming Language(http://cm.bell-labs.com/cm/cs/awkbook/) with
some extensions.
@section awk_ext EXTENSION
@section awk_ext EXTENSIONS
Some language extensions are implemented and they can be enabled by setting the
corresponding options.
@ -83,13 +83,30 @@ BEGIN {
}
@endcode
@subsectin awk_ext_fnc EXTENDED FUNCTIONS
index() and match() can accept the third parameter indicating the position
where the search should begin. The negative position enables backward search.
@subsection awk_ext_return RETURN
The return statement is valid in BEGIN blocks, END blocks, and pattern-action
blocks as well as in functions. The execution of a calling block is aborted
once the return statement is executed.
@subsection awk_ext_comment COMMENT
You can use the C-style comment as well as the pound comment.
@subsection awk_ext_fnc EXTENDED FUNCTIONS
index() and match() can accept the third parameter indicating the position
where the search begins. A negative value indicates a position from the back.
@code
BEGIN {
xstr = "abcdefabcdefabcdef";
xsub = "abc";
xlen = length(xsub);
i = 1;
while ((i = index(xstr, xsub, i)) > 0)
{
print i, substr(xstr, i, xlen);
i += xlen;
}
}
@endcode