|
Shell Escaping: There are several methods for escaping special characters in the Linux shell: Double quotes: Double-quoted strings require escaping of only a few characters. Example: >echo “Some String: &>|\”\$’\`\s\\” Some String: &>|”$’`\s\ This method is useful as long as the string contains few or no characters that are special to the shell. It also . . . → Read More: Shell escaping in Perl According to the documentation, the utf8::decode() function should generally set/turn on the UTF-8 flag for a string that contains multi-byte characters. However, apparently, there are circumstances under which utf8::decode() may not only not set the flag, but may actually unset/clear/turn off the flag for a string that contains multi-byte characters. The following script contains 4 . . . → Read More: utf8::decode() may actually unset the UTF-8 flag The UTF-8 (Unicode) character encoding system is a well supported alternative to the older ISO-8859-1 (Latin-1) system that can make it easier to work with special characters and multiple languages. Many developers can exercise sufficient control over their system to ensure that: All Perl source code is encoded in UTF-8 All text input files and . . . → Read More: Perl: Default to UTF-8 encoding The W3C CSS validator is an online service for checking a stylesheet for standards compliance. This service can be accessed in Perl via the WebService::Validator::CSS::W3C module, which is handy for automating validation. However, for checking a large number of stylesheets, it is better to run a local install of the validator so as not to . . . → Read More: Perl access to local install of the W3C CSS validator This is in an Apache::ASP based system, but should theoretically work in any web environment. I wanted to create a global default error handler ($SIG{__DIE__}) that displays the error text on the page. Some notes: It is generally recommended that run-time errors be trapped on a case-by-case basis using try/catch style eval statements. A global . . . → Read More: Perl global error handler Just ran into a limitation of Perl regular expressions. It’s mentioned (in brackets!) here: http://www.foo.be/docs/tpj/issues/vol1_2/tpj0102-0006.html, but I didn’t see mention of it in the Perl manual, so this wasn’t easy to track down. It’s stated as: “Perl currently has an internal limit of 32K repeats for parenthetical items”. The following code is sufficient to demonstrate . . . → Read More: Perl regular expressions – limit |
