Regular Expressions Builder Step 3: Run match pattern test. Step 2: Enter a string to test. Bell Backspace Tab Carriage return Vertical tab Form feed Newline Escape ASCIcharacter as octal ASCIcharacter as hex ASCI control character Unicode character as hex A nonescape character Beginning of line End of line Beginning of string End of line or string Exactly the end of string Where search started On a word boundary Not on a word boundary Matches any single character except \n Matches single character in list Matches single character not in list Matches single character in a range Matches a word character; same as [a-zA-Z_0-9] Matches a nonword character Matches a space character; same as [\n\r\t\f] Matches a nonspace character Matches a decimal digit; same as [0-9] Matches a nondigit Matches all occurences of preceding expression Matches the preceding character or subexpression one or more times. Matches the preceding character or subexpression zero or one time. Matches the preceding character exactly n times. Matches the preceding character at least n times. Matches the preceding character at least n and at most m times. When this character immediately follows any of the other quantifiers (*, +, ?, {n}, {n,}, {n,m}), the matching pattern is non-greedy. Matches pattern and captures the match. Matches pattern but does not capture the match. Example: industr(?:y|ies) Positive lookahead matches the search string at any point where a string matching pattern begins. Negative lookahead matches the search string at any point where a string not matching pattern begins. Matches either x or y. Matches the control character indicated by x. Matches a form-feed character. Equivalent to \x0c and \cL. Matches a newline character. Equivalent to \x0a and \cJ. Matches a carriage return character. Equivalent to \x0d and \cM. Matches a tab character. Equivalent to \x09 and \cI. Matches a vertical tab character. Equivalent to \x0b and \cK. Escapes: Position: Content: Result: String: Pattern: Step 1: Compose a match pattern. Use combobox selections for RE syntax. Compose & test Regular Expressions.