Grep "Global Regular Expression Print"
Basic regular expressions: ^ -- Caret symbol, Match beginning of the line. $ -- Match End of the line * -- Match 0 or more occurrence of previous character . – Match Any single character [ ] – Match Range of characters, just single occurrence. [a-z] –Match small letters [A-Z] –Match cap letters [0-9] – Match numerical. [^] – Match Negate a sequence \ -- Match Escape character. Extended regular expressions: + --Match one or more occurrences of previous character. | -- Match Either character ? – Match 0 or 1 occurrence of previous character. ( ) –match a group of characters {number} –Match number of occurrence of a character {1, 3} –Match a character which is 1 to 3 times repetition {5, } –Match a repeated character which is repeated 5 or more times. \{x,y\} -M atch x to y occurrences of the preceding. \{x\} -M atch exactly x occurrences of the preceding. \{x,\} -M atch x or more occurrences of t...