Regular Expressions

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Reference

- 0 or more matches

* 1 or more matches

? 0 or 1 match

^ matches the start of the string or line

\ signifies an escape sequence

\$ matches the end of the string or line

. matches any single character except newline

( ) capturing group. Save to reuse later

| used as a logic OR inside a capturing group

[abc] character set. Matches one of the things in the brackets

[^abc] Negated character set. Matches anything except...

[a-zA-Z] all upper and lowercase letters. You can specify any range.

{1} exact number of matches. Comes after a set or group.

{1,5} inclusive range for number of matches

{1,} minimum number of matches

{,5} maximum number of matches

\s any whitespace character

\S any NON whitespace character

\d any digit. Same as [0-9]

\D any NON digit

\w any word character. Same as [a-zA-Z0-9_]

\W any NON word character. Same as [^a-za-z0-9_]

\b word boundary

\B NON word boundary

[\b] - escape sequence for a backspace character

\u0404 - 4 digit unicode hex value for a character