square brackets with regex

[Robbo]

I'm trying to write a regex that will accept the following string:

<#cinput: type="select" name="fk_pl_mplyposid[]" table="pl_en_plypos" id="ID" values="Position" other="MULTIPLE" />

The main problem stems from the fact that the string contains square braces ([]). I can write a regex to accept a string with an opening square brace:

$regex_custom_input = "<#cinput: ((type|name|table|id|values|other)=\"[[a-zA-Z0-9_]+\" )+/>";

but not one that includes both square brackets. I'm using the PHP function ereg() to evaluate the regex. According to the POSIX documentation to get the closing sqr. bracket to work you have to:

To include a literal ]' in the list, make it the first character (following a possible^').

So I figured the regex:

$regex_custom_input = "<#cinput: ((type|name|table|id|values|other)=\"[][a-zA-Z0-9_]+\" )+/>";

would work but no luck.

Ideas?

[Robbo]

Well for those interested and those that may have have this problem in the future I've found an answer. Seems that the main cause of error may have been a parenthesis problem or the non-inclusion of ^..$ in the regex. The latter highlights awareness as to whether you're parsing for a string as a sub-string or not. The regex that will parse:

<#cinput: type="select" name="fk_pl_mplyposid[]" table="pl_en_plypos" id="ID" values="Position" other="MULTIPLE" />

properly is:

^<#cinput: ((type|name|table|id|values|other)=\"([][a-zA-Z0-9_])+\" )+/>$

This may look nasty to beginners but I'd recommend learning how to use regex's.