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in that usage it means the beginning of a string.. so in that line foo has to be at the beginning.. if there is anything before foo it does not match..
in a regular expression if '^' is used in a bracket grouping, ex. [^a-d], it means match anything that's not in the brackets. So in the example, match anything that's not a,b,c, or d.
well, you can do 'man grep' as there is a regular expression tut in there. I'm not a guru with regex (I use them, but my usage experience is pretty limited), but i believe there are some differences between perl regex and grep regex.
well, you can do 'man grep' as there is a regular expression tut in there. I'm not a guru with regex (I use them, but my usage experience is pretty limited), but i believe there are some differences between perl regex and grep regex.
The main difference is in the metacharacters you have to escape - perl tends to do things the "other way round" to grep regexps, usually because the deemed "more common usage" has fewer keystrokes in perl. Can be confusing if you use both a lot!
As mentioned in this book Mastering Regular Expressions by Jeffrey E. F. Friedl, the various tools eg sed/grep/perl etc, each have their own internal regex engines, which are similar, but not identical, so care is needed at all times.
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