Sed Regular Expressions: Difference between revisions

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* [[Regular Expressions]]
* [[Regular Expressions]]


=Special Characters (need to be escaped in regular expressions)=
=<span id='Special_Characters_.28need_to_be_escaped_in_regular_expressions.29'></span>Meta-Characters - Special Characters (need to be escaped in regular expressions)=


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Revision as of 17:05, 7 June 2018

Internal

Meta-Characters - Special Characters (need to be escaped in regular expressions)

/
"
$ # unescaped signifies end of line 
^ # unescaped signifies the beginning of a line
!
[
]
:
* # zero or more
. # dot

Non-Special Characters (do not need to be escaped in regular expressions)

<
>
(
)
!
-
{
}
+ # this is interesting, I thought '+' is a meta-character, more experimentation necessary.

Grouping

Use \( and \) for grouping. Parentheses must be escaped to be interpreted as grouping separator.


Examples

Match everything except space:

     [^ ]*
     .*

seems to work too.

Words (digits, alpha, _):

sed -e 's/[0-9a-zA-Z_]*/THIS_WAS_A_WORD/g'

Blank spaces (spaces, tabs, newlines): \s does not seem to work.

Regular Expression Syntax

TO NORMALIZE across java Regular Expression Syntax, grep Regular Expression Syntax, sed Regular Expression Syntax.