The | character in a regular expression is a logical OR. ? follows a quantifier to make it lazy.Īvoid putting two in the same expression, the result can be unpredictable.īeware of nesting quantifiers, for example, the pattern (a*)*, as itĮxponentially increases processing time. Number of occurrences between 0 and the maximum value includedīy default, with quantifiers, the regular expression engine is greedy: itĮxtends the selection as much as possible. Number of occurrences between the minimum value included and the infinite Number of occurrences between the minimum and maximum values included Number of occurrences of the expression preceding the quantifierĠ or 1 occurrence of the expression. Use the “dot all” checkbox or the (?s) regexp modifier to include the newline character. Space, non-breaking space, tab, return lineĪny character except newline. ] +> to select an HTML tag Shorthand character classes ¶Īny non-numeric character (same as )Īn alphanumeric character ( ) including characters with accent mark and ligatures Abbreviated classes can be used inside a class The characters - exclude what follows themĪll letters (including foreign accented characters). The caret (^) placed at the beginning of the class excludes the characters of the class (complemented class) To include the dash in a class, you must put it at the beginning or at the end so as not to confuse it with the hyphen that specifies a range of charactersĪny character except a digit. Uppercase or lowercase letters, or a dash.
Lowercase letters from a to z or numbers from 0 to 9 Does not include characters with accent mark and ligatures Regexp engine available in most parts of calibre.Ĭharacter classes are useful to represent different groups of characters, This checklist summarizes the most commonly used/hard to remember parts of the
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