Cẩm Nang Regex

Matches any single character except newline (unless s flag is set).

Matches any digit character (0-9). Equivalent to [0-9].

Matches any character that is not a digit. Equivalent to [^0-9].

Matches any alphanumeric character plus underscore. Equivalent to [a-zA-Z0-9_].

Matches any character that is not a word character. Equivalent to [^a-zA-Z0-9_].

Matches any whitespace character: space, tab, newline, carriage return, form feed.

Matches any character that is not whitespace.

Matches any one of the characters inside the brackets.

Matches any character NOT inside the brackets.

Matches any character in the specified range (inclusive).

Matches any uppercase or lowercase letter using combined ranges.

Matches hexadecimal characters by combining digit and letter ranges.

Matches the start of a string (or line in multiline mode).

Matches the end of a string (or line in multiline mode).

Matches the position between a word character and a non-word character.

Matches any position that is NOT a word boundary.

Matches the preceding element zero or more times (greedy).

Matches the preceding element one or more times (greedy).

Matches the preceding element zero or one time (optional).

Matches the preceding element exactly n times.

Matches the preceding element at least n times (greedy).

Matches the preceding element between n and m times (inclusive, greedy).

Matches zero or more times, but as few as possible (lazy/non-greedy).

Matches one or more times, but as few as possible (lazy/non-greedy).

Matches zero or one time, preferring zero (lazy/non-greedy).

Groups multiple tokens together and captures the matched text for back-referencing.

Groups tokens together without capturing. Useful for applying quantifiers to groups.

Captures the matched text and assigns it a name for easier reference.

Matches the same text as previously captured by the nth capturing group.

Captures one alternative from inside a group. Combines grouping with alternation.

Matches the expression before or after the pipe. Acts as a boolean OR.

Matches a literal backslash character.

Matches a line feed character (LF, U+000A).

Matches a horizontal tab character (U+0009).

Matches a carriage return character (CR, U+000D).

Matches a literal period/dot character.

Matches a literal caret character.

Matches a literal dollar sign character.

Matches a literal opening parenthesis.

Find all matches rather than stopping after the first match.

Makes the entire pattern case-insensitive.

Makes ^ and $ match the start/end of each line rather than the whole string.

Makes the dot (.) match newline characters as well.

Enables full Unicode matching. Required for proper emoji and surrogate pair handling.

Matches only at the index indicated by the lastIndex property. Does not search forward.

Asserts that what follows the current position matches the pattern, without consuming characters.

Asserts that what follows the current position does NOT match the pattern.

Asserts that what precedes the current position matches the pattern, without consuming characters.

Asserts that what precedes the current position does NOT match the pattern.