with textile installed all I get is a blank page

A bit of playing shows that it is only certain tags which cause the problem, this works:

test
*aa*
**bold**

but this fails:

h1. header
test
*aa*
**bold**

Lists also kill it

I've tracked it down to the regexp around line 850 of modules/textile/textilephp/Textile.php. If this regexp is used the blank page is returned, if this is reduced to something simple it seems to work ok. There is another regexp around 953 which also seems to cause the same problem.

{^(h[1-6]|p|bq|bc|fn\d+) ((?:(?: (?:\([A-Za-z0-9_\- \#]+\)) | (?:{ [A-Za-z0-9_\-](?: \( [^)]+ \) | [^\}] )+ }) | (?:\|[^\|]+\|) | (?:\(+?(?![A-Za-z0-9_\-\#])) | (?:\)+) | (?: \[ [a-zA-Z]+? \] ) )*|(?:<>|[<>=]))*) (\.\.?) (?::(\d+|(?: # Must start out right... (?=[a-zA-Z0-9./#]) # Match the leading part (proto://hostname, or just hostname) (?: # ftp://, http://, or https:// leading part (?:ftp|https?|telnet|nntp)://(?:\w+(?::\w+)?@)?[-\w]+(?:\.\w[-\w]*)+ | (?:mailto:)?[-\+\w]+@[-\w]+(?:\.\w[-\w]*)+ | # or, try to find a hostname with our more specific sub-expression (?i: [a-z0-9] (?:[-a-z0-9]*[a-z0-9])? \. )+ # sub domains # Now ending .com, etc. For these, require lowercase (?-i: com\b | edu\b | biz\b | gov\b | in(?:t|fo)\b # .int or .info | mil\b | net\b | org\b | museum\b | aero\b | coop\b | name\b | pro\b | [a-z][a-z]\b # two-letter country codes ) )? # Allow an optional port number (?: : \d+ )? # The rest of the URL is optional, and begins with / . . . (?: /? # The rest are heuristics for what seems to work well [^.!,?;:"'<>()\[\]{}\s\x7F-\xFF]* (?: [.!,?;:]+ [^.!,?;:"'<>()\[\]{}\s\x7F-\xFF]+ #'" )* )? )))?\ (.*)$}sx

That doesn't work for me. I still get a blank page.

Checking the regexp in a page with its own error handling shows that there is a bracket missing somewhere in it.

A friend tried this on his hosting platform with a version of php 5 and it works fine for him. I'm on version 4.4.7. It may make a difference.