Re regular expression 13_review of regex symbols

Review of Regex Symbols

This chapter covered a lot of notation, so here's a quick review of what you learned:

• The ? matches zero or one of the preceding group.

• The * matches zero or more of the preceding group.

• The matches one or more of the + preceding group.

• The {n} matches exactly n of the preceding group.

• The {n,} matches n or more of the preceding group.

• The {,m} matches 0 to m of the preceding group.

• The matches at least N and at a most m of the {n,m} preceding group.

• {n,m}?Or *? or +? performs a nongreedy match of the preceding group.

• ^spammeans the string must begin with spam.

• spam$means the string must end with spam.

• .the matches any character, except newline characters.

• \d, \w , and \s match a digit, word, or space character, respectively.

• \D, \W , and \S match anything except a digit, word, or space character, respectively.

• [abc]Matches any character between the brackets (such as a, b, or C).

• [^abc]Matches any character that isn ' t between the brackets.

Re regular expression 13_review of regex symbols