Regex escape sequence error in Java

Question

p = "<a href=\".*?\"\\stitle=\"(.*?\")>.*?<\/a><span class=\"event-nodetype\">\((.*?\)</span><span class=\"event-timeleft\">\()(.*?\)<\/span><li>)";

This is regex i created for

<a href="/bu/?q=node/775" title="YOK ED?LEN MEDEN?YET: GEÇ OSMANLI VE ERKEN CUMHUR?YET DÖNEMLER?NDE GAYR?MÜSL?M VARLI?I">YOK ED?LEN MEDEN?YET: GEÇ OSMANLI VE ERKEN CUMHUR?YET DÖNEMLER?NDE GAYR?MÜSL?M VARLI?I</a><span class="event-nodetype">(Konferans / Kongre / Sempozyum)</span><span class="event-timeleft">(Devam etmekte)</span><li>

But eclipse gives error of

Invalid escape sequence (valid ones are \b \t \n \f \r \" \' \\ )

I put \ to " and other things but still i cant fix it.

What is the problem?

When i split the line into 4 lines

 p = "<a href=\".*?\"\\stitle=\"(.*?\")>"
        + ".*?<\/a><span class=\"event-nodetype\">\(("
        + ".*?\)</span><span class=\"event-timeleft\">\()("
        + ".*?\)<\/span><li>)";

the error seems on line 2.

There's an invalid escape sequence towards the end of the line: <\/span> — ElGavilan
– ElGavilan, Commented Nov 20, 2015 at 17:54
but in html </span><li> i need to put that so i need that slash?and it did not change anything. Error seems at beginning because beginning of this line is red — user3575963
– user3575963, Commented Nov 20, 2015 at 17:55
It all depends in the language that you are using. The error message doesn't list a forward slash as one of the escaped sequences, so it's probably safe to say that you don't need to escape it here. — ElGavilan
– ElGavilan, Commented Nov 20, 2015 at 17:57
There is also this one on the second line of your edit: <\/a> — ElGavilan
– ElGavilan, Commented Nov 20, 2015 at 18:00
I did but this time eclipse doesnot give what i want. But according to regexr.com, i could find 6 matches. Now none. — user3575963
– user3575963, Commented Nov 20, 2015 at 18:17

Alan Moore · Accepted Answer · 2015-11-20 18:35:54Z

1

\" is correct, an so is \\s (but I would use \\s+). All the other backslashes in your regex need to be escaped: \\/, \\(, \\) (/ doesn't need escaping, but doing so doesn't hurt anything). This is for the string literal, not for the regex; the backslash is an escape character for both.

answered Nov 20, 2015 at 18:35

Alan Moore

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