PHP Regular Expression Tester

Intro

Pattern Modifiers

Pattern Syntax

Regular Expression Syntax

Regular Expression Pocket Reference

Mastering Regular Expressions

Regular Expression

Pattern Modifiers

Final Regex pattern

Enter your data here

Enter replacement string
(backreferences are ok)

Enter PHP callback function
(Please follow PHP syntax)

function my_replace_callback($matches)
{

$output = $matches[0];

return $output;

}

Regular expression function

preg_match_all preg_match preg_split preg_replace preg_replace_callback

Regular expression flags

limit

Error occured

Output PHP code

Output function return

Output Matched Results

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.	Any character
^	Start of subject (or line in multiline mode)
$	End of subject (or line in multiline mode)
[	Start character class definition
]	End character class definition
\|	Alternates (OR)
(	Start subpattern
)	End subpattern
\	Escape character
\n	Newline (hex 0A)
\r	Carriage return (hex 0D)
\t	Tab (hex 09)
\d	Decimal digit
\D	Charchater that is not a decimal digit
\h	Horizontal whitespace character
\H	Character that is not a horizontal whitespace character
\s	Whitespace character
\S	Character that is not a whitespace character
\v	Vertical whitespace character
\V	Character that is not a vertical whitespace character
\w	"Word" character
\W	"Non-word" character
\b	Word boundary
\B	Not a word boundary
\A	Start of subject (independent of multiline mode)
\Z	End of subject or newline at end (independent of multiline mode)
\z	End of subject (independent of multiline mode)
\G	First matching position in subject
n*	Zero or more of n
n+	One or more of n
n?	Zero or one occurrences of n
{n}	n occurrences
{n,}	At least n occurrences
{,m}	At the most m occurrences
{n,m}	Between n and m occurrences

i	(PCRE_CASELESS) If this modifier is set, letters in the pattern match both upper and lower case letters.
m	(PCRE_MULTILINE) When this modifier is set, the "start of line" and "end of line" constructs match immediately following or immediately before any newline in the subject string, respectively, as well as at the very start and end.
s	(PCRE_DOTALL) If this modifier is set, a dot metacharacter in the pattern matches all characters, including newlines.
x	(PCRE_EXTENDED) If this modifier is set, whitespace data characters in the pattern are totally ignored except when escaped or inside a character class, and characters between an unescaped # outside a character class and the next newline character, inclusive, are also ignored.
A	(PCRE_ANCHORED) If this modifier is set, the pattern is forced to be "anchored", that is, it is constrained to match only at the start of the string which is being searched (the "subject string").
D	(PCRE_DOLLAR_ENDONLY) If this modifier is set, a dollar metacharacter in the pattern matches only at the end of the subject string.
S	If this modifier is set, then this extra analysis is performed. At present, studying a pattern is useful only for non-anchored patterns that do not have a single fixed starting character.
U	(PCRE_UNGREEDY) This modifier inverts the "greediness" of the quantifiers so that they are not greedy by default, but become greedy if followed by "?".
X	(PCRE_EXTRA) This modifier turns on additional functionality of PCRE that is incompatible with Perl. Any backslash in a pattern that is followed by a letter that has no special meaning causes an error, thus reserving these combinations for future expansion.
u	(PCRE_UTF8) This modifier turns on additional functionality of PCRE that is incompatible with Perl. Pattern and subject strings are treated as UTF-8.