In a regular expression, which characters need escaping?
In general, which characters in a regular expression need escaping?
regular-expression
What is the email matching regex in basic regex for grep?
I created a text file and put some email addresses in it. Then I used grep to find them. Indeed it worked:
find command with regex quantifier e.g. {1,2}
I have been trying to create a find command string that will find all files that end with a number 1-99 but exclude all others.
Simple sed replacement of tabs mysteriously failing
This ought to be really simple, but for some reason it is not working:
Replacing Multiple blank lines with a single blank line in vim / sed
Question more or less says it all. I’m aware that /^$/d will remove all blank lines, but I can’t see how to say ‘replace two or more blank lines with a single blank line’
rsync certain files, excluding the rest, ignoring .svn/ directory, recursively
I’m using rsync to copy some files from a share to another.
How to detect end of line with sed
I’m looking for a way to only execute replacement when the last character is a newline, using sed.
What is the regex to validate Linux users?
When adding a new user, how is the string validated?
grep and escaping a dollar sign
I want to know which files have the string $Id$.
Are there zero-width assertions in sed?
Is it possible to make lookahead or lookbehind zero-width assertions in sed? I want to emulate Perl’s (?=) and family.