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

/
/
gm

Test String

Substitution

Processing...

Code Generator

Generated Code

$re = '/^/m'; $str = '0gXFABYYJ4w 9SbT3q1a6dQ Px9m5hkr4R0 si65inj9DTQ Bi5kyehmeaY RRKBuSYVjcg Vus1JBAwPz4 J6dl8Gicvv0 9OpVlBDOXYI MWERAZARYMw 36EBd2Q4-gg R3nDIZ1XE8Y nH3a-wwkkkU WdlyIH2DX60 VTSHzCZ-xss HBZctpwwPbA rxbCaiyYSXM 2YHV9ikQ8fM pm8JXbh-Nc4 GVgfAfj4Eig TnbSasaBnZ8 jhufM4oeBqE xEd1WsRKikw qAHTwM5QvHY s1ATTIQrmIQ OnrEnWG99RA k-AvkeMrybI scMv18TrCv0 dZ20GnK2qy4 dRX1Qc1BUz8 xWl5NcRB8UI _DIYqQnJNZE 8jK0yIEUpxg f81PzYbCkEE uWqnCCGe4lU 80Uz2iP1FCI e7I9uSqjxIU S-EPItXKHn8 CvQY0J4UAPc h8gkUsjjusU Pu8myhboOv4 9FMZfTJKmyM dySPsLzD8AI DuMDzczLoXY ZtgLSzoFUMM 72KC8xMmERU vup1zS44HtM 4k7dEJVFKYM jS1wmaNVGts toyaz8OgKlA zyJP3Cckw24 Ou0evRc1Deg ttVCIx5xvMQ tBfWb5IrbOI l0S05wu6WKk ZOZD6Oe0Inc VJit1m74YfQ pnS1JZcAw68 -IRbsYNBBFQ 68ZFFoToojU gVHCYIdbLg4 YYZz8BXN7ag 1HSQO4wRiU8 0gOX4W2PNGM BA5pmLE-fMk oig3Mqg7rzs NR23z1sm6JA Cw8081tNzZA 0lH8_5ORDsM Uu9wrx3_1A4 Ag9r0BavajU si9-L-8clOE hCcQG8EGB5M snwUE9XkmXg 2_eudldBr9U vgOTxZtlXys mmK71ZfaZO4 K5Vm_592_3g UgLEeINmXBk PWdM8XJ7ets f4GL62UTcdQ CvUhGKhvfrI 46JmTj5JEVI NPiAK33CfxQ zgZ52M4a_R0 2l4GAPu36fA I6UQukiQbnk p0zIbYCu7Yc rOjbXSry87w 67vr-3kpX3Q JocAXINz-YE B-RyOg1yt48 9tbRaEHFhh8 tfa7lLEMZDA 6glk4oMbgKE 1JTndrLHHt8 PidI5ZVgpx8 5pErjN8l2c4 scogMj8GjOo QIuIdZ_L4iY ufWIQbb2-qg csY_i30TbsM cV77lUcEvyE 9gpvus-fPyo zz3U9xMQvOo 6tLjsVu917A -WUfUald0-U rm4vsbU7KDo BnBNJo1Lqrc Im6SCddgBiA OgQ2ecwZodU oKsYe4Lbfao do47TMppVcw 4L56cDBpGAg jGh08mM7NZE uxYmRvULqqc GlcT6eN7fWk D27Bf2oQdP8 9-Y4Nb8lvjU qLdPs7e3sq8 CClxaRJ0zfU TW8zIUb0Pes ZBPV27IE6-Q CSLztmp1pMk yhYK7Mrp8DM 0ymCdRe2y0c LYa5q2AjWNQ m9LQBc_sR9Y -FQ9i737-Vk 5F2R0FjzRaI m-BEAKGllM0 q06FRYlAZeg DddW7_tLOXc H413p-5LaIY 9p0pqng6xTg 2jpGJHvWNGE qyLL__QinB0 MSVbHDb35kM fXLzyVghHDs HInIGGXhJHs rOHTCzwsg1s nwuNWRxd2SA Kr4EQDVETuA MXNDVJix94Y iyGK6S4gCuk 4OdCNJ2pA1M v_mpRUw_JDk fHmmS8J0CNI J7p4bzqLvCw FR9FAH1wnx8 2f6Kg4l8P6s NKFWojBa9vw 6-OjwC1pTPE 1xfFVBzceoY 7jTRZF7XoJg pJi5VwKin_I Nk-ZGhs8Ntk 8dMuOnST7Yo OPG9VKXbdFM 9ScC8HAhnBk 1cgPtmLRAsM gqpdZ34sVAw UhZbOQYj4oM 5fAy2qbzLlw 6xelOXDPqOU SpOd2ZkkGzg 69cgop62oZU DnEOoCWqY9M 6JUGglBsczQ WKB9bIz5T_M 6LjdJgTSIRo o08YscncCTc 6yARlD8ES6U wxi66Wm0XQw v8nbdnSpQX4 uJPxcv5veNU ukTKLdpITVU BdI7r2Fjiys JR8qHvqBkYo 6_E3VzxtRMc fM2Z2et00ww puBNNKp3m7A 0EyeuEmMBl4 6D6eXGRAbHo Oe456lW5Nek 9R7FEhpqU3s LtJc2QbM_pQ Qnwo6NtLe30 g-LJaQKnpug hAxeU0gtDkY sQq7vjCt1Mo CIyWAkFnX3U GIbyKYv7hKk AWv0MuSRll4 bMTI_t0CKE0 58SZRooWqqw oH03ruYF8p0 lxhCRI8OeZw fQ-hYPUspaI P-6y9EsTMBk 0z0dZhIIC50 oMzM3PmYP04 WV9axjWCAUY XmN4pI0oD88 QPXC4WShltM IX_RjAxYyXA Mz1vZKKBkK4 u765IT19u7Y Zxnnuj4Vp_g L6wWO3qoGQg -7HMCgJpXjM 1Oe06936C0c -PU9GA9VLTw sd-dK8OqtVU EmU7_cHfmxQ UeYYwUhwGxc 2kpgKmDgw5Y UCHLxIN0_ag FetujvIrAUY z1_BHJpbcsc jR7qi2Q1xLc gvrVXKAUhSQ dz4e2TfJ86U vBtvhPM2GHc ULSKXyITnrg j5F4tPhtsdA I0o1rgVsd18 pj4UebFCeoY jb5R5pe68bo HnHvacpkG0g 5NFL2uV7kps 1aWflmFDres LfKvGCFmBuM MgIBoRIBQD0 lHl9-CcDD1s bO3XsqJ-xo4 286OjxGt_Yc 3J4F0mWitrA -rSKujuF0f4 jj-_1kvwO4o Yl-Z9DOqluc canQwTAoxIw s7yvqysENYY AY7H2sNBVZI QTa6m_lW2R8 Bf-eRpMS2Q4 GcVKnErkbSQ 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KZ6Qs5ipIq4 Pulrsg3FizI XmZYt-JBTkw A4YPuj9H0Wk qy33soZLh3w cRFHm-EJsE0 5aGTim8PVh8 ZpqrdN6E9-k QqnNyMXpuwo O0Id0olaeFw 1AVYFk6hydo Mb_GmBX5QvI nbSNF9_b6jc dr7VcTX_5pc CvBGyQvBs9c WYT4gMDHYZw sI1JdpnKLBk z7MzeWiqsVg qD6vx7IQCS0 Y0lAfQc-iHM Fx7_8G6DQ1I 3cmJvY1g_bQ M-0TB9JMpdE l9fN-8NjrvI kc-eSOUNtbk bs5hFgVpGME 6nLfSN2u5gg frYLvC0mM50 ovH9u4HpeFY 9Ut5l3hZRn0 x3gSsfev1UA anWb6yQejJU JdaJM4RZppw 2y6zdAbN9o8 M8q5mg-yj0A fpgSYmjs2YY VhVZa63iHzM '; $subst = "https://youtube.com/watch?v="; $result = preg_replace($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