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Editorial Team
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Asked: 2026-05-18T01:38:53+00:00

I’m trying to create a regular expression that matches when the string starts with

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I’m trying to create a regular expression that matches when the string starts with 1 or more alpha characters followed by exactly 1 ? and ending with 1 or more alpha characters

What I have so far is

[A-Za-z]+\?{1}[A-Za-z]+

but this is causing my program to crash. Any ideas? Thanks for any responses.

UPDATED

Here is the exception:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 
'Can't do regex matching, reason: (Can't open pattern U_REGEX_RULE_SYNTAX 
(string fe?ing, pattern [A-Za-z]+?{1}[A-Za-z]+, case 0, canon 0))'

Seems to be ignoring the escape character for the ?

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1 Answer

  1. Editorial Team

    That does look right. Maybe take off the “{1}” but it works with Perl expressions when I try it.

    Try doing this: if you put the “?” into a character class to see if you can break out of the crash.

    [A-Za-z]+[?][A-Za-z]+
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