Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
g

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

$re = '/(.*),(.*),(.*),(.*)/'; $str = ',UBS154754528,A121215441,10 ,UBS154754528,A121215442,20 ,UBS154754528,A121215443,15 GFdfgdfD45454dfgd5457,UBS154754528,A121215444,25 AAA454545455,UBS154754528,A121215445,254 vvGFD454545457,UBS154754528,A121215446,215 dad454545457,UBS154754528,A121215447,55 eww454545457,UBS154754528,A121215448,214 asd454545457,UBS154754528,A121215449,26 trtr454545457,UBS154754528,A121215450,25 ,UBS154754528,A121215451,251 ,UBS154754528,A121215452,252 ,UBS154754528,A121215453,23 ,UBS154754528,A121215454,251 gdfgd454545457,UBS154754528,A121215455,251 dfdf454545457,UBS154754528,A121215456,25 fgdfgd454545457,UBS154754528,A121215457,95 gdfgFD45dfg4545457,UBS154754528,A121215458,58 dfgdf4545fg45457,UBS154754528,A121215459,254 dfgd45454dfgfd5457,UBS154754528,A121215460,25 dfdfGFD45dfgdf4545457,UBS154754528,A121215461,254 ,UBS154754528,A121215462,66 ,UBS154754528,A121215463,22 ,UBS154754528,A121215464,54 GfdfgD454fd545457,UBS154754528,A121215465,24 GFfdgD454dfg545457,UBS154754528,A121215466,45 GFfdgD45454fgd5457,UBS154754528,A121215467,11 fgfD4545dfg45457,UBS154754528,A121215468,255 GFfdgD454dfgd545457,UBS154754528,A121215469,88 '; $subst = "insert into test_table values('$1','$2','$3',$4);"; $result = preg_replace($re, $subst, $str); echo "The result of the substitution is ".$result;

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php