Level 85
Level 87
11 words 0 ignored
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Ignore words
Check the boxes below to ignore/unignore words, then click save at the bottom. Ignored words will never appear in any learning session.
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Metacharacters
characters with a special meaning
\d
Find a digit
\s
Find a whitespace character
\b
Find a match at the beginning or at the end of a word
\uxxxx
Find the Unicode character specified by the hexadecimal number xxxx
Quantifiers
define quantities
+
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
pattern.test(string);
searches a string for a pattern, and returns true or false, depending on the result
/substring/.exec(string);
searches a string for a specified pattern, and returns the found text
