Convert wildcard-like input into a regular expression for exact matching, escaping metacharacters and treating each character as a flexible placeholder.

database.yml may vanish after a pulled commit deletes it from the repository, leaving local configuration missing.

iPad playback can fail on valid MP4 files even when H.264 settings are correct; some HTTP servers omit headers iOS expects for streaming.

Generate random numbers in Ruby under different conditions, including Gaussian and triangular distributions, when simple uniform randomness is not enough.

Ruby charting library for Rails that generates PNG graphs with themes, multiple series, and automatic sizing for large datasets.

Inline images can leave a small gap below them because they align to the text baseline, reserving space for descenders. vertical-align: middle or display: block removes the gap.

Deleting pixels in GIMP can either reveal transparency or fill with the background color, depending on whether the layer has an alpha channel.

Responsive layouts can switch styles when content wraps onto multiple lines or stays on one line, enabling different treatment for narrow screens.

Wrong Ruby interpreter settings in RubyMine cause misleading inspections when a project uses a different Ruby version than the default.

PDFs with embedded bitmap images can become large when raster data stays uncompressed; ghostscript or printer compression settings reduce file size when high image quality is unnecessary.

Rails 3 can now save records without running callbacks, reducing side effects when callbacks should be bypassed.

Capistrano can fail with net/ssh load errors or an Net::SSH::KnownHosts::SUPPORTED_TYPE constant error when paired with net-ssh 2.5.1. Upgrading to 2.5.2 restores compatibility.

MySQL 5.1 can use the faster InnoDB Plugin instead of the built-in engine, improving performance without changing the file format.

Haml inserts unwanted spaces around inline links, leaving punctuation separated from the anchor. Several workarounds avoid the gap without adding a helper.

beginning_of_day and end_of_day on Date and DateTime ignore Rails 2 time zones, so database queries can hit the wrong records.

Routing a dotted path can break Rails format detection, leaving format as html despite an XML constraint. Matching the route without the extension preserves the intended xml format.

Removing duplication often means finding repeated concepts rather than identical lines, since similar code can hide different intent and reuse can create false matches.

Integrating cross-cutting concerns in Ruby can reduce duplication and keep logging, security, and other shared behavior separate from core business logic.

Checking whether an Ubuntu or Debian system is 32-bit or 64-bit helps match software and troubleshoot compatibility. uname -m reveals the machine architecture.

Rails fails to start when the rails executable points at a missing or half-installed gem set, often after an RVM mismatch or interrupted install.

Rails console sessions can exercise routes, requests, and helpers without running the full app in a browser.