regex and g modifier

[Rolf Kemper]

Dear All,

may be some one can comment why belows code snipet does not work.(only
one 'i' item is returned) I tried to use the g modifier in order to
get an array of values back. (My expection is
index 0 to 6 where the first index holds the last match according the
documentations I found)

My environment is Windows 2000 Server and IE6

+++++++++++++++ +++++++++++++++ +++++++++++++++ +++++++++++++++ ++++++++++++++
var out='';
var reg_sigs = /(i)/g;
var sigrows = reg_sigs.exec(" o,i1&&i2,~i1||~ i2,~i2&&i1");
if (sigrows) {
for ( i=0; i < sigrows.length ; i++) {
out = out + "\n" + i + ' ' + sigrows[i];
}
alert(out)
}
else {alert('no match')}

+++++++++++++++ +++++++++++++++ +++++++++++++++ +++++++++++++++ ++++++++++++++

Is the g modifier only supported for substitutions ? !

Any help and hint is welcome.
Rolf

[Martin Honnen]

Re: regex and g modifier



Rolf Kemper wrote:
[color=blue]
> Dear All,
>
> may be some one can comment why belows code snipet does not work.(only
> one 'i' item is returned) I tried to use the g modifier in order to
> get an array of values back.[/color]

You need to loop if you use exec and want to find all matches:

var reg_sigs = /(i)/g;
var sigrows;
while (sigrows = reg_sigs.exec(" o,i1&&i2,~i1||~ i2,~i2&&i1")) {
var out = '';
for ( i=0; i < sigrows.length ; i++) {
out = out + "\n" + i + ' ' + sigrows[i];
}
alert(out)
}

Or use the match method of strings e.g.

var reg_sigs = /(i)/g;
var sigrows;
var s = "o,i1&&i2,~i1|| ~i2,~i2&&i1";
sigrows = s.match(reg_sig s);
var out = '';
for ( i=0; i < sigrows.length ; i++) {
out = out + "\n" + i + ' ' + sigrows[i];
}
alert(out)

--

Martin Honnen

http://JavaScript.FAQTs.com/

[Mick White]

Re: regex and g modifier

Rolf Kemper wrote:
[color=blue]
> Dear All,
>
> may be some one can comment why belows code snipet does not work.(only
> one 'i' item is returned) I tried to use the g modifier in order to
> get an array of values back. (My expection is
> index 0 to 6 where the first index holds the last match according the
> documentations I found)
>
> My environment is Windows 2000 Server and IE6
>
> +++++++++++++++ +++++++++++++++ +++++++++++++++ +++++++++++++++ ++++++++++++++
> var out='';
> var reg_sigs = /(i)/g;
> var sigrows = reg_sigs.exec(" o,i1&&i2,~i1||~ i2,~i2&&i1");[/color]

var sigrows = "o,i1&&i2,~i1|| ~i2,~i2&&i1".ma tch(reg_sigs);

// String.match() method may be the better choice, the exec method of
regEx needs to called continually ("for" or "while" loop ) to create the
Array of matching results.

Mick
[color=blue]
> if (sigrows) {
> for ( i=0; i < sigrows.length ; i++) {
> out = out + "\n" + i + ' ' + sigrows[i];
> }
> alert(out)
> }
> else {alert('no match')}
>
> +++++++++++++++ +++++++++++++++ +++++++++++++++ +++++++++++++++ ++++++++++++++
>
> Is the g modifier only supported for substitutions ? !
>
> Any help and hint is welcome.
> Rolf[/color]