Hi Wolfgang, this really is an interesting addition!
> Syntax: env regex [-g] [-s subst] regex name [...] > > The code is based on SLRE (http://slre.sourceforge.net/) > which provides a tiny subset of Perl regular expressions. > > Without options, this will implement regex pattern matching on > environment variables. Variables with matching values will be printd > as with "env print", so this basicly performs a "grep" on the given > list of variables. Ok, this usage looks fine. > With "-s subst", the matching pattern gets replaced with the string > given in "subst". Back references '\0' ... '\9' are allowed, where > '\0' stands for the whole matched string, and '\1', '\2', ... are > replaced with the first, second, ... sub-pattern. > > "-g" allows for global replacement. But IMHO this usage doesn't really belong into the "env" command. It much rather is a further operation of the setexpr command: set environment variable as the result of eval expression", name value1 <op> value2\n" - set environment variable 'name' to the result of the evaluated\n" express specified by <op>. <op> can be &, |, ^, +, -, *, /, %" We could add the <op>erations for regsubst and regsubstg. For actual names for the operations, I'm somewhat unsure. Maybe "function like", i.e. "regsubst(string, pattern, replacement)" and "regsubstg(string, pattern, replacement)"? > Examples: > => setenv foo abcdefghijklmnop > => env reg 'A' '[bdgmo]' foo > => env reg -s 'A' '[bdgmo]' foo > foo=aAcdefghijklmnop > => env reg -g -s 'B' '[bdgmo]' foo > foo=aAcBefBhijklBnBp > => env reg -g -s '\\2--\\1' '(Be).*(kl)' foo > foo=aAckl--BeBnBp So I'd vote for => setenv result regsubst($foo, '[bdgmo]', 'A') What do you think? Cheers Detlev -- To you I'm an atheist; to God, I'm the Loyal Opposition. -- Woody Allen -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: d...@denx.de _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
