ios - EXC_BAD_ACCESS with NSRegularExpression matchesInString: -

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i have line of code in app uses regular expression find pgp keys in string of user input. 

    nsarray *pgpkeymatch = [pgpkeyregex matchesinstring:userinput                                                 options:0                                                   range:nsmakerange(0, [userinput length])];

for cases works expected. i've run problem when particularly long key input (length of 334,629 instead of ~9,000). get: thread 1: exc_bad_access(code=1, address=0x8) , app crashes.

i've tried using zombies instrument (which found nothing) , setting exception breakpoint (which didn't yield more information).

stepping through code shows nsrange created successfully, goes wrong later in execution of matchesinstring: .

does have insight on what's causing bad access? or why issue long key? below more complete excerpt of code:

nsstring *userinput = self.inputkey.text;  nserror *pgpkeyregexerror = null; nsregularexpression *pgpkeyregex = [nsregularexpression regularexpressionwithpattern:@"(?:-----begin pgp (?:public|private) key block-----)\n(?:(?:.*:.*)\n)*\n(?:[^-]|\n)*\n(?:-----end pgp (?:public|private) key block-----)"                                                                              options:0                                                                                error:&pgpkeyregexerror];    nsarray *pgpkeymatch = [pgpkeyregex matchesinstring:userinput                                             options:0                                               range:nsmakerange(0, [userinput length])];


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