regex

regex object

• let pattern = /w3schools/i;

modifiers

• g Perform a global match (find all matches rather than stopping after the first match)
• i Perform case-insensitive matching
• m Perform multiline matching

Brackets

• [abc] Find any character between the brackets
• [^abc] Find any character NOT between the brackets
• [0-9] Find any character between the brackets (any digit)
• [^0-9] Find any character NOT between the brackets (any non-digit)
• (x|y) Find any of the alternatives specified

Metacharacters

• . Find a single character, except newline or line terminator
• \w Find a word character
• \W Find a non-word character
• \d Find a digit
• \D Find a non-digit character
• \s Find a whitespace character
• \S Find a non-whitespace character
• \b Find a match at the beginning/end of a word, beginning like this: \bHI, end like this: HI\b
• \B Find a match, but not at the beginning/end of a word
• \0 Find a NULL character
• \n Find a new line character
• \f Find a form feed character
• \r Find a carriage return character
• \t Find a tab character
• \v Find a vertical tab character
• \xxx Find the character specified by an octal number xxx
• \xdd Find the character specified by a hexadecimal number dd
• \udddd Find the Unicode character specified by a hexadecimal number dddd

Quantifiers

• n+ Matches any string that contains at least one n
• n* Matches any string that contains zero or more occurrences of n
• n? Matches any string that contains zero or one occurrences of n
• n{X} Matches any string that contains a sequence of X n's
• n{X,Y} Matches any string that contains a sequence of X to Y n's
• n{X,} Matches any string that contains a sequence of at least X n's
• n$ Matches any string with n at the end of it
• ^n Matches any string with n at the beginning of it
• ?=n Matches any string that is followed by a specific string n
• ?!n Matches any string that is not followed by a specific string n

RegEx methods

• exec() Tests for a match in a string. Returns the first match
• test() Tests for a match in a string. Returns true or false
• toString() Returns the string value of the regular expression