Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In computer programming, leaning toothpick syndrome (LTS) is the situation in which a quoted expression becomes unreadable because it contains a large number of escape characters, usually backslashes (""), to avoid delimiter collision. The official Perl documentation introduced the term to wider usage; there, the phrase is used to describe regular expressions that match Unix-style paths in which the elements are separated by forward slashes. LTS appears in many programming languages and in many situations, including in patterns that match Uniform Resource Identifiers (URIs) and in programs that output quoted text. Many quines fall into the latter category.

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