re : strings in which ^a : a is the beginning char a$ : a is the end char a? : 0 or 1 a a+ : 1 or more a a* : 0 or more a ^a : doesn't contains a . : matches any character {3,5} : range of 3 to 5 [abcf] : matches any one of a,b,c or f [[:space:]] : matches spaces [[:space:]]{4,} : matches 4 or more spaces [a-z] : a to z [a-zA-Z] : a to z and A to Z d : any digit s : space w : any alphabet w+(.ab)w+(53) : grouping (.ab) into group 1 and (53) into group 2, use them using \1,\2 Exercises: 1. ab(cd)ef to abcdef rename -f 's/\([a-zA-Z0-9]+\)//g' * 2. ab_cde_f to ab cde f rename -f 's/_/ /g' * 3. 0abcde to abcde rename -f 's/(0)+([0-9a-zA-Z-.]+)/$2/g' * 4. a.enbc to a bc rename -f 's/\.en/ /g' * 5. a-bcdef to a bcdef rename -f 's/-/ /g' * 6. AbcDeF to abcdef rename -f 'y/A-Z/a-z/' *
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