regular expression

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gaurav v bagga - 17 Jan 2007 17:18 GMT

hi all,

i am new to regular expression finding it difficult to write one for
".." and "..."

i'll appreciate if any one provides me with one :)

regards
gaurav

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Randolf Richardson - 17 Jan 2007 18:27 GMT

> hi all,
>
> i am new to regular expression finding it difficult to write one for
> ".." and "..."
>
> i'll appreciate if any one provides me with one :)

    The period is a wildcard. Use the following to quote the quoting
character so that it will be quoted:

        "\\.\\." and "\\.\\.\\."

    Also, highly recommended reading:
http://www.mindprod.com/jgloss/regex.html

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Randolf Richardson - kingpin+nntp@lumbercartel.ca
The Lumber Cartel, local 42 (Canadian branch)
http://www.lumbercartel.ca/

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gaurav v bagga - 18 Jan 2007 05:04 GMT

hi,

thanks for reply
but
StringBuffer limit= new StringBuffer("");
a2[1]="..";
limit.append(a2[1].replaceFirst("[\\.\\.]", ","));

doesn't work for me
instead of ".."=>","
i get
",."

!!!!!!!

regards
gaurav

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Hendrik Maryns - 18 Jan 2007 11:26 GMT

gaurav v bagga schreef:

> hi,
>
[quoted text clipped - 5 lines]
>
> doesn't work for me

Of course not. Why did you put the brackets in there? Did you read the
link Randolf gave you? The brackets mean: either of the symbols in
here. So [\\\.\\.] means: a dot or a dot, i.e. a dot. That is, the
first dot is found and gets replaced. If you want both dots, just
remove the brackets.

> instead of ".."=>","
> i get
> ",."

For a good introduction to regular expressions, I suggest you read
perlretut (google for it). It is written for Perl, but Java has almost
the same syntax, except for the quoting oddities (i.e. everywhere you
need \ in Perl, you need \\ in Java).

H.
- --
Hendrik Maryns
http://tcl.sfs.uni-tuebingen.de/~hendrik/
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regular expression

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