I'm getting a weird warning, and as a result my regex search isn't working. Here's the line:
NSRange r = [HTML rangeOfString:@"\|(.*)\|" options:NSRegularExpressionSearch];
Where HTML
is a string that I'm sure contains a single match for the above regex.
The warning is only on the first occurrence of "\|", not on both.
Any help is much appreciated!
You're getting the warning because \|
is not a valid escape sequence in Objective-C (or C or C++ for that matter). The compiler is ignoring that and just using a raw |
character instead, so the string you're actually passing in is @"|(.*)|"
.
To get the behavior you want, you have to escape the backslash in your source code so that the regex engine sees the literal backslash and interprets the |
character as a literal instead of as alternation, e.g. @"\\|(.*)\\|"
.