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Regular expressions enable you to match possible variations on a pattern, as well as patterns located at different points in the text. You can search for patterns in your text that have different ending or beginning letters, or you can match text at the beginning or end of a line. The regular expression special characters are the circumflex, dollar sign, asterisk, period, and brackets: ^, $, *, ., []. The circumflex and dollar sign match on the beginning and end of a line. The asterisk matches repeated characters, the period matches single characters, and the brackets match on classes of characters. See Table 11-5 for a listing of the regular expression special characters. Table 11-5: Regular Expression Special Characters Match Operation Start of a line End of a line Any character Repeated characters Classes References the beginning of a line References the end of a line Matches on any one possible character in a pattern Matches on repeated characters in a pattern
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Character ^ $ . * []
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Matches on classes of characters (a set of characters) in the pattern Note Regular expressions are used extensively in many Linux filters and applications to perform searches and matching operations. The Vi and Emacs editors and the sed, diff, grep, and gawk filters all use regular expressions.
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To match on patterns at the beginning of a line, you enter the ^ followed immediately by a pattern. The ^ special character makes the beginning of the line an actual part of the pattern to be searched. In the next example, ^consists matches on the line beginning with the pattern "consists":
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^consists consists of a stream of
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The next example uses the $ special character to match patterns at the end of a line:
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The period is a special character that matches any one character. Any character will match a period in your pattern. The pattern b.d will find a pattern consisting of three letters. The first letter will be b, the third letter will be d, and the second letter can be any character. It will match on "bid", "bad", "bed", "b+d", or "b d", for example. Notice the space is a valid character (so is a tab). For the period special character to have much effect, you should provide it with a context-a beginning and ending pattern. The pattern b.d provides a context consisting of the preceding b and the following d. If you specified b. without a d, then any pattern beginning with b and having at least one more character would match. The pattern would match on "bid", "bath", "bedroom", and "bump", as well as "submit", "habit", and "harbor".
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The asterisk special character, *, matches on zero or more consecutive instances of a character. The character matched is the one placed before the asterisk in the pattern. You can think of the asterisk as an operator that takes the preceding character as its operand. The asterisk will search for any repeated instances of this character. Here is the syntax of the asterisk special character:
c* matches on zero or more repeated occurrences of whatever the character c is: c cc ccc cccc and so on.
The asterisk comes in handy when you need to replace several consecutive instances of the same character. The next example matches on a pattern beginning with b and followed by consecutive instances of the character o. This regular expression will match on "boooo", "bo", "boo", and "b".
bo* book born booom zoom
no match
The .* pattern used by itself will match on any character in the line; in fact, it selects the entire line. If you have a context for .*, you can match different segments of the line. A pattern placed before the .* special characters will match the remainder of the line from the occurrence of the pattern. A pattern placed after the .* will match the beginning of the line up until the pattern. The .* placed between patterns will match any intervening text between those patterns on the line. In the next example, the pattern .*and matches everything in the line from the beginning up to and including the letters "and". Then the pattern and.* matches everything in the line from and including the letters "and" to the end of the line. Finally, the pattern /o.*F/ matches all the text between and including the letters o and F.
.*and and.* o.*F Hello to you and to them Farewell Hello to you and to them Farewell Hello to you and to them Farewell
Note Because the * special character matches zero or more instances of the character, you can provide a context with zero intervening characters. For example, the pattern I.*t matches on "It" as well as "Intelligent". Suppose instead of matching on a specific character or allowing a match on any character, you need to match only on a selected set of characters. For example, you might want to match on words ending with an A or H, as in "seriesA" and "seriesH", but not "seriesB" or "seriesK". If you used a period, you would match on all instances. Instead, you need to specify that A and H are the only possible matches. You can do so with the brackets special characters. You use the brackets special characters to match on a set of possible characters. The characters in the set are placed within brackets and listed next to each other. Their order of listing does not matter. You can think of this set of possible characters as defining a class of characters, and characters that fall into this class are matched. You may notice the brackets operate much like the shell brackets. In the next example, the user searches for a pattern
beginning with "doc" and ending with either the letters a, g, or N. It will match on "doca", "docg", or "docN", but not on "docP".
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