Regular Expressions
This document provides a brief description of the syntax of regular expressions.
- A list of characters enclosed by [ and ] matches any character in the list.
- A list of characters enclosed by [ and ] with ^ as the first character matches any character not in the list.
- A range of characters can be expressed by separating the first and last characters in the range by a hyphen and enclosing them by [ and ].
- A period (.) matches any single character.
- A regular expression matching a single character (i.e. not a range)
can be followed by a repetition operator:
- ? indicates that the preceding item is optional, matched once at most.
- * indicates that the preceding item will be matched zero or more times.
- + indicates that the preceding item will be matched one or more times.
- {n} indicates that the preceding item is matched exactly n times.
- {n,} indicates that the preceding item is matched n or more times.
- {,m} indicates that the preceding item is optional and is matched m times at most.
- {n,m} indicates that the preceding item is matched at least n times, but no more than m times.
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