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comparison sed.xml @ 7:d64eace4f9f3 draft

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Uploaded
author bgruening
date Sat, 17 Jan 2015 08:30:15 -0500
parents 8928e6d1e7ba
children 062ed2bb4f2e
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6:8928e6d1e7ba 7:d64eace4f9f3
100 - **s/hsa-mir-([^ ]+)/short name: \\1 full name: &/** will find strings such as 'hsa-mir-43a' (the regular expression is 'hsa-mir-' followed by non-space characters) and will replace it will string such as 'short name: 43a full name: hsa-mir-43a'. The **\\1** marker is a place holder for 'whatever matched the first parenthesis' (similar to perl's **$1**) . 100 - **s/hsa-mir-([^ ]+)/short name: \\1 full name: &/** will find strings such as 'hsa-mir-43a' (the regular expression is 'hsa-mir-' followed by non-space characters) and will replace it will string such as 'short name: 43a full name: hsa-mir-43a'. The **\\1** marker is a place holder for 'whatever matched the first parenthesis' (similar to perl's **$1**) .
101 101
102 102
103 **sed's Regular Expression Syntax** 103 **sed's Regular Expression Syntax**
104 104
105 The select tool searches the data for lines containing or not containing a match to the given pattern. A Regular Expression is a pattern descibing a certain amount of text. 105 The select tool searches the data for lines containing or not containing a match to the given pattern. A Regular Expression is a pattern descibing a certain amount of text.
106 106
107 - **( ) { } [ ] . * ? + \ ^ $** are all special characters. **\\** can be used to "escape" a special character, allowing that special character to be searched for. 107 - **( ) { } [ ] . * ? + \ ^ $** are all special characters. **\\** can be used to "escape" a special character, allowing that special character to be searched for.
108 - **^** matches the beginning of a string(but not an internal line). 108 - **^** matches the beginning of a string(but not an internal line).
109 - **(** .. **)** groups a particular pattern. 109 - **(** .. **)** groups a particular pattern.
110 - **{** n or n, or n,m **}** specifies an expected number of repetitions of the preceding pattern. 110 - **{** n or n, or n,m **}** specifies an expected number of repetitions of the preceding pattern.
111 111
112 - **{n}** The preceding item is matched exactly n times. 112 - **{n}** The preceding item is matched exactly n times.
113 - **{n,}** The preceding item ismatched n or more times. 113 - **{n,}** The preceding item ismatched n or more times.
114 - **{n,m}** The preceding item is matched at least n times but not more than m times. 114 - **{n,m}** The preceding item is matched at least n times but not more than m times.
115 115
116 - **[** ... **]** creates a character class. Within the brackets, single characters can be placed. A dash (-) may be used to indicate a range such as **a-z**. 116 - **[** ... **]** creates a character class. Within the brackets, single characters can be placed. A dash (-) may be used to indicate a range such as **a-z**.
117 - **.** Matches any single character except a newline. 117 - **.** Matches any single character except a newline.
118 - ***** The preceding item will be matched zero or more times. 118 - ***** The preceding item will be matched zero or more times.
119 - **?** The preceding item is optional and matched at most once. 119 - **?** The preceding item is optional and matched at most once.
120 - **+** The preceding item will be matched one or more times. 120 - **+** The preceding item will be matched one or more times.
121 - **^** has two meaning: 121 - **^** has two meaning:
122 - matches the beginning of a line or string. 122 - matches the beginning of a line or string.
123 - indicates negation in a character class. For example, [^...] matches every character except the ones inside brackets. 123 - indicates negation in a character class. For example, [^...] matches every character except the ones inside brackets.
124 - **$** matches the end of a line or string. 124 - **$** matches the end of a line or string.
125 - **\|** Separates alternate possibilities. 125 - **\|** Separates alternate possibilities.
126 126
127 127
128 **Note**: SED uses extended regular expression syntax, not Perl syntax. **\\d**, **\\w**, **\\s** etc. are **not** supported. 128 **Note**: SED uses extended regular expression syntax, not Perl syntax. **\\d**, **\\w**, **\\s** etc. are **not** supported.
129 129
130 @REFERENCES@ 130 @REFERENCES@
131 ]]> 131 ]]>
132 </help> 132 </help>
133 </tool> 133 </tool>