regex_reference.md

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Regex reference sheet	/regex_cheat_sheet/	true

Regex reference sheet

This page serves as a quick reference guide for regular expression, including common tokens, meta sequences, general tokens, group constants, and more.

{% tabs %} {% tab Common tokens %}

Common tokens
A single character of: a, b, or c
A character except: a, b, or c
A character in the range: a-z
A character not in range: a-z
A character in the range: a-z or A-Z
Any single character
Any whitespace character
Any non-whitespace character
Any digit
Any non-digit
Any word character
Any non-word character
Capture enclosed
Match either a or b
Zero or one of a
Zero or more of a
One or more of a
Exactly 3 of a
Between 3 and 6 of a
Start of string
End of string
A word boundary
None-word boundary
{: .reset-td-br-1 .reset-td-br-2}
{% endtab %}
{% tab Meta sequence %}

Meta sequence
Any Unicode sequences, line breaks included
Match one data unit
Unicode newlines
Vertical whitespace character
Negation of \v
Horizontal whitespace character
Negation of \h
Reset match
Match nth sub-pattern
Unicode property X
Negation of \pX
Unicode property or script category
Negation of \p
Quote; treat as liberals
Match sub-pattern 'name'
Match sub-pattern 'name'
Match sub-pattern 'name'
Match nth sub-pattern
Match nth sub-pattern
Recurse nth capture group
Recurse nth capture group
Match nth relative previous sub-pattern
Recurse nth relative upcoming sub-pattern
Match nth relative upcoming submitter
Recursive names capture group
Match previously-named capture group 'letter'
Recurses names capture group 'letter'
Hex character YY
Hex character YYYY
Octal character ddd
Control character Y
Backspace character
Makes any character literal
{: .reset-td-br-1 .reset-td-br-2}
{% endtab %}
{% tab General tokens %}

General tokens
Newline
Carriage return
Tab
Null character
{: .reset-td-br-1 .reset-td-br-2}

{% endtab %} {% tab Character class modifiers %}

Character class modifiers
A single character of: a, b, or c
A character except: a, b, or c
A character in the range: a-z
A character not in range: a-z
A character in the range: a-z or A-Z
Letters and digits
Letters
ASCII codes 0-127
Space or tab only
Control characters
Digits
Visible characters (not space)
Lowercase letters
Uppercase letters
Word characters
{: .reset-td-br-1 .reset-td-br-2}
{% endtab %}
{% tab Group constants %}

Group constants
Capture everything enclosed
Match either a or b
Match everything enclosed
Atomic grouping (non-capturing)
Duplicate sub-pattern group number
Comment
For case insensitivity
Named capturing group
Named capturing group
Named capturing group
Inline modifiers
Conditional statements
Recursive conditional statements
Conditional statement
Lookahead conditional
Lookbehind conditional
Recurse entire pattern
Recurse first sub-pattern
Recurse first relative subpattern
Recurse subpattern 'name'
Match subpattern 'name'
Recurse subpattern 'name'
Pre-define patterns before use
Positive lookahead
Negative lookahead
Positive lookbehind
Negative lookbehind
Control verb
Control verb
Control verb
Control verb
Control verb
Control verb
Control verb
Pattern modifier
Pattern modifier
Pattern modifier
Pattern modifier
Pattern modifier
Line break modifier
Line break modifier
Line break modifier
Line break modifier
Line break modifier
Line break modifier
Line break modifier
Line break modifier
Regex engine modifier
Regex engine modifier
Regex engine modifier
Regex engine modifier
{: .reset-td-br-1 .reset-td-br-2}
{% endtab %}
{% tab Quantifiers %}

Quantifiers
Zero or one of a
Zero or more of a
One or more of a
Exactly 3 of a
3 or more of a
Between 3 and 6 of a
Greedy quantifier
Lazy quantifier
Possessive quanitifer
{: .reset-td-br-1 .reset-td-br-2}
{% endtab %}
{% tab Anchors %}

Anchors
Start of match
Start of string
End of string
Start of string
End of string
Absolute end of string
A word boundary
A non-word boundary
{: .reset-td-br-1 .reset-td-br-2}
{% endtab %}

{% tab Flags and modifiers %}

Flags and modifiers
Global
Multiline
Case-sensitive
Ignore whitespace
Single line
Unicode
Extended
Ungreedy
Anchor
Duplicate group names
{: .reset-td-br-1 .reset-td-br-2}

{% endtab %} {% tab Substitution %}

Substitution
Complete match contents
Contents in capture group 1
Contents in capture group foo
Hexidecimal replacement values
Tab
Carriage return
Newline
Form-feed
Uppercase transformation
Lowercase transformation
Terminate any transformation
{: .reset-td-br-1 .reset-td-br-2}
{% endtab %}
{% endtabs %}