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

/
/
gmi

Test String

Code Generator

Language

Generated Code

$re = '/([rnbqkp1-8]+\/){7}([rnbqkp1-8]+) [bw] (-|KQ?k?q?|K?Qk?q?|K?Q?kq?|K?Q?k?q) (-|[a-h][36]) \d+ \d+/mi'; $str = '7P/2P1b3/2r5/2r2p2/pk6/3B2p1/3K1P2/8 b Qk - 7 234 7n/N4pp1/3n4/3K4/2r5/1Q6/2RbB2P/P7 b Kkq - 6 64 8/8/1n6/3r1P2/6P1/3P3P/8/8 b Kk c3 19 224 8/p1P4P/1p1p2K1/3P2B1/5P2/R6p/k5P1/3P4 w Kk - 4 203 2n5/4q3/3rN3/2p2P1Q/2P2P2/N2P4/4p3/B2B2P1 w Q - 24 136 8/1P1Qp2q/1p1k3R/1n5P/bPp4P/n7/pp2B3/5p2 b KQ c6 3 206 8/4b3/2k5/1p1K4/B5n1/8/7P/3Q4 w Kq - 7 191 6P1/3p4/1Pp2k2/K2P4/1r1q1n1B/1Q4P1/4pP1b/2P5 w - b3 36 224 2k5/8/4P3/2P1Q3/2bP3p/8/N6K/1pP2p1N b Kq - 16 71 1k6/2PB1q2/2Prp2p/p3Q3/6P1/3P4/6p1/Pp4B1 w kq b3 48 189 1P6/3B4/pN2P3/6P1/B1P2Nk1/7b/8/8 w KQk e3 36 39 3k3q/5p2/1RN5/6N1/5P2/1r5b/8/2nB4 b Kk a3 11 87 8/4P3/p2P3p/8/1p4N1/5br1/5p2/B6p b Kk h6 45 36 8/8/2p2b2/1P4P1/4n3/8/2P3R1/8 w KQ g6 26 73 5p2/p5P1/1n6/8/8/2p1N3/8/3pr3 w KQkq f6 25 210 2p5/P5pp/3P4/2Pp3p/2Pp4/5P2/2P5/1q1Kk1b1 b KQkq - 25 14 1NPp1kPr/Kpb5/3P2q1/1N2B3/8/8/P7/Q1n1p1P1 b Kkq - 24 254 Q7/P7/4n3/4NR2/1p2K3/8/4B3/5r2 b KQq - 9 111 6bP/n7/3P3P/3p3n/5p2/B7/4P3/2N5 b KQq d6 11 234 1P3Q2/P5b1/3p1p1r/1p3NK1/5R2/4p3/8/8 b Kk f3 38 250 p7/8/4R2p/8/8/4P3/4pn2/p2rNb1P w q - 34 263 7P/8/3B1P1p/1P1K4/p7/R7/7P/1p2r3 b Qq - 35 24 1K2P1N1/1n3p2/1k1pP1b1/2p1b2B/5R2/8/3P1B1q/1r1P4 w KQ c6 23 200 1Rbb2Pp/2p3p1/8/5R2/3p3p/N7/2q5/P7 w q - 7 240 8/1N1pn1K1/1p1P1Q2/8/1b1Rp3/1k3r2/P6p/8 w Q a6 29 26 P6P/4n3/rN1p1k2/4P1R1/p3P3/3b1K2/p2q4/1pBp4 b Qkq c6 36 162 8/R1P4P/B7/7p/4B3/4p2P/N5P1/3Pr3 b KQ - 27 177 8/1q2R3/2p5/2N5/8/P3Pr2/4rB1p/7p w Qq - 2 50 8/3k4/8/8/P3P3/1BP2p2/2p1N3/4n3 w Qkq f3 43 48 3p4/pP6/3n3p/1N2P3/Q6N/2k4p/1B4K1/8 b q f3 17 267 7P/r5n1/3P4/7b/8/3P4/4P2P/8 w Kk - 35 33 4p3/1PP2r2/7R/1Q1P4/b7/4R3/pp2NPn1/2p1BK1N w - - 1 226 4n3/P5bN/4P1P1/4R2P/B3pp2/1P6/5k2/4K3 w KQkq - 16 2 5p2/8/1B6/p3n3/1K1p1PR1/4P3/8/2B5 w Qq - 20 83 p7/7P/1R6/7p/2p2p2/1Pqn1P2/2Pp3K/5B2 w Kk a6 42 21 2k1PPb1/2N5/5P2/Q1P1nK2/6R1/2r1RB1p/2P5/8 w kq a6 18 230 1P6/K7/P7/3n2r1/p3N3/Rp2P3/8/4p3 w Kq - 23 121 1Rbq2N1/3N4/1Q1P4/6P1/4kP2/3P4/Pp3n2/B1P1p2K b KQ c3 10 176 8/5pn1/6p1/8/7p/5K1p/P2p3p/q3k2b w Kq - 11 99 4nN2/8/1pR1K3/5p2/1np5/R7/5p2/3r2b1 b Kq - 14 201 R7/5k2/3P1P2/7p/B7/5n2/Np5p/r7 w KQk h6 41 190 6B1/5P2/3R4/8/1p6/3P4/8/P4bp1 w Qq - 19 30 1Q1PP3/1pp1P1r1/p2N3N/1p3q1r/8/8/4n3/2RP4 w kq - 0 68 3PQ3/P3qk2/1n1pP3/4K3/3P4/8/2PN4/p2P4 b KQq a3 42 138 1Q1p1P2/b7/r3P3/1p6/2B1N2P/1p6/3q4/1r6 w Qk a3 29 235 4N3/5R2/PpQ5/1p4k1/7B/1n6/8/4b3 b kq b6 40 162 p6P/8/2P5/7r/2p5/b1B2P2/1r1P4/8 w - e3 20 4 2B5/kQ6/5br1/8/7P/8/1R2P1n1/4rqp1 b Qk - 15 67 2P1bp1P/2b2P2/2P2BRK/2r4n/2N3P1/2R5/1N4k1/4p3 b q g3 17 152 8/n1p1p3/1P1k4/R1n5/7r/1P6/B7/2p1PPB1 b KQq - 24 17 1b6/4P3/nq2p2B/2b4K/6r1/4R1p1/P2pp2P/2PP3p w - b6 27 254 n3p3/5p2/8/7P/8/3B3N/8/P1N5 b - - 1 234 8/2b5/6n1/pNB3np/1P6/8/1B2q3/P6P b Qk g3 5 63 1p1PPRn1/N1R2K2/1P1q4/4pp2/3P2B1/8/2p2Ppr/p7 w KQk c6 26 174 2p5/6pB/8/n7/P5N1/8/R1NQ1P2/4b3 w - - 46 171 8/p7/4p3/3nKp2/1q4P1/3r1b2/1p6/B1Q1B3 w KQk a6 17 52 6pP/2B5/1qn5/5pP1/1K1Q3p/R6b/2pr1PRk/8 w Kkq d3 23 96 3kN2Q/5p2/2K5/4nBb1/4P1p1/4q1P1/n2b1p1R/8 w Kk - 36 146 3pR3/5N2/p7/2PbpppP/8/1Q3q2/4RB2/5PP1 b k f6 47 60 n5k1/1r2P3/8/8/PR1P4/8/2b5/8 b - a6 14 238 2P5/5N1P/1Q6/4B3/3n3P/B4p2/8/1P3P2 b Qk - 32 166 8/8/P3KP2/4R3/8/r7/b4P2/2N2r2 w Q - 3 251 8/Q6N/1P6/1P2b3/8/3P1pr1/1nB4R/4P2r b Q e3 31 33 P1B4N/2p3Rq/K1b3p1/4b1p1/P4n1k/2r2P2/5n2/4p3 b k b6 24 168 8/8/1p1PP2b/6B1/p2Pp2Q/5P2/2P5/1Nk2R2 w - c6 46 258 Q1P3p1/1n4N1/8/3B3P/7p/PP6/5bP1/8 b Kq h6 24 240 1N6/2PK1pP1/1p6/4P1rk/p5Bp/P1P4B/4p1P1/8 b - - 19 146 Pp6/4P3/pr3b2/2N5/2K2P2/8/1n5n/8 b Kkq - 35 192 3Qp3/8/4R3/8/8/2r1P1Pr/1bP3p1/8 b kq b3 40 159 4N2r/7N/P3Bb1B/QP1p4/PPnP4/1P2P3/R3npqP/1p6 b KQk - 41 239 8/4Pp2/2k5/b1N4P/2P2rn1/B7/p1p1p1P1/4P2N b K f3 47 218 4p3/8/1P2B3/6b1/8/3rQ3/2pb4/P3p3 b k - 40 36 1k4r1/2pP2rp/1p3P2/4p3/1p6/7K/1N4P1/B1Nb1P1p w Kk - 41 224 4P2R/1p1N1qB1/8/3P4/8/4p3/8/7P b Qk - 11 48 k7/Np1P4/p1b1K3/3P1r2/P7/8/B7/4RpnP w q - 21 260 P3RP2/p7/1B6/2p5/rB6/Pk6/3pp3/p4Q2 w KQkq e6 25 134 B7/1P4r1/5q2/p1P5/p7/P3Npn1/2R4k/5B1P w k - 5 253 6n1/q7/8/2rp4/2Np4/NP1R4/3p4/2p5 b KQ a6 18 261 8/2B1qR2/1QP5/3P4/1P3P2/1R3p2/4r1PP/1r2p2B b kq e6 8 238 8/6PR/8/2N5/2p1p2p/1npR3p/1B6/K7 b Q h6 1 23 2B5/p5P1/2Q5/2KN4/P4q2/5p1n/2p3R1/6p1 b k - 20 265 3p2p1/8/3b4/3kp3/8/7N/r6p/1r1P4 w kq - 8 100 2p1R3/8/4prpR/8/nkN5/2P5/5B1n/7P w q b6 37 136 6nb/Q2PP3/p3Pp2/2r5/4P3/8/4p1r1/8 w K - 31 141 6p1/3n1k1Q/4q3/3P4/3N4/1P1p3b/r7/2P3B1 b K g3 19 229 3n4/2pP1N1p/2pPq1R1/p7/2KP4/8/7R/6P1 b K g6 2 176 P2p4/2K4P/3p2n1/p7/3R1P2/Q6P/2r1p1B1/1Rkp4 b KQ d6 17 116 4Pp2/n2P2b1/3BkR2/P7/6p1/b7/3P1n1Q/2P5 w q e6 35 198 3p4/2P5/7P/8/1R5N/7q/4Pp2/P7 w Kk b3 47 99 P7/P7/8/4n1kR/4n3/8/7q/4N1pP b Qk - 7 71 4r3/4Bpp1/7q/2KP1B2/3R1p1p/1N1p4/4P3/8 b - - 32 64 3p2pr/P7/8/3P3b/4pk1p/1P6/8/1q1P2P1 w Qkq a6 2 228 p1P2bp1/N2K4/7B/1P3r2/P6k/8/1P6/6p1 b KQq a6 0 222 5R2/b4pp1/8/3N3P/3B2nB/p7/4p3/8 w kq - 13 229 2k1P1p1/5b2/3B4/1n1P1PRp/p4BP1/1q6/p2nQ3/8 w kq d3 36 11 3bpB2/2bN4/6rQ/2N5/KR6/5p2/3k4/8 b K b6 35 103 7B/p2n4/8/3P4/8/3p4/1p6/5r2 w Kk - 17 22 4B3/Nr6/4P3/8/1B6/1b3p2/3p4/2PQP3 b k e6 43 81 k3P3/r7/4N1PP/3B1p2/Q3r3/8/2p3P1/3p4 w KQk - 26 39 PP5r/8/n2K4/8/p2Q4/5b2/4p2N/4N3 b Kkq - 33 171 1P6/3PRp2/1P5p/5pP1/4b2P/1B1k4/2N2p2/8 b Kq d6 38 163 8/1K6/3bN2P/8/Pp6/8/5Np1/3r2k1 b Kkq f6 48 115 2p2P2/b6n/8/1p6/4P3/8/8/2pq1r2 b KQkq e3 31 174 6pR/r1n5/P4P1b/1kN1NP1p/3p1qpP/3r4/1R5b/B1p5 b KQ a6 39 225 P7/2P5/r4K2/P3P3/4P1b1/1B5p/8/r7 b k e6 7 59 pNp5/1n2Pr2/2N5/P7/6b1/5Pp1/R1bp4/8 b Q e6 11 203 3P1pR1/3pp3/Pp6/r1b2K1Q/3pnP2/5B2/2P2r2/1N6 w Kq h3 4 12 q1pk4/3P2NP/4P1P1/1pQR2K1/P1bp4/3NB2n/8/p2P4 b KQq c3 19 165 1P3p2/6B1/8/p5p1/2R3K1/1b6/PP6/Q1P1NP2 b KQq e6 17 10 6np/6R1/5bp1/8/PRr5/2PP1P2/N1p3p1/8 w q - 14 234 8/8/8/8/5N2/3R4/5P2/p3NP1P w Kkq - 24 110 5N2/p7/2P5/6p1/8/Nr1R3p/q4b2/3p3r w KQk g6 25 223 2KB3p/r7/P2pPn2/P3R3/6n1/2r3p1/8/8 w - d6 16 114 7P/2n2p2/4p1b1/P3PN2/3p2p1/nr6/3r4/7p b KQq f3 33 42 4p3/6p1/8/P6r/5bn1/p7/4P3/2p1Q1k1 b q g6 26 132 8/7N/1pp4p/5R2/8/8/k3P1P1/3P4 w KQk g3 21 220 6r1/3p4/R1b1pp1p/1P1P2pp/p1q5/2P5/8/Pp1Q4 w kq - 36 146 8/8/7N/8/2Kr4/8/4n1p1/2nP4 b Kq f3 19 170 3r4/2PP3R/3P3b/1P6/3B2p1/7R/2np4/3Nb3 w Qkq h3 29 142 P3Pb2/8/2r5/8/2B2k2/6Pp/3p4/4p2R b - d6 1 181 P2NP3/8/5R2/8/1n6/P1p4p/2k5/5Q2 w q - 16 152 4p3/4B3/7k/K1p2p2/8/3R4/2b5/P7 w KQ b3 45 183 1P4r1/5p2/3N4/4p3/5PP1/P2RK3/3P1q1p/8 b KQq - 2 82 1pB1P2P/5Pp1/k4p2/1Nr5/2b3K1/2BPn3/8/1P3Q1P b KQkq - 29 180 8/1P6/2p1pb2/r3r2P/8/4N1P1/1pB5/2nRpN1P b Kk c3 21 81 Q7/P7/7P/4NP2/8/3p3r/7P/1p1R1nP1 b Kk h3 0 215 8/q1n4r/RN6/p4p2/5b2/1p2N2P/5rp1/1pQ3K1 b Kk - 23 105 3r1P2/8/p2P3Q/2PR2b1/p7/5NRp/3b3p/2K5 b K - 8 160 1K1r4/4P3/8/3R4/1p2R3/1ppPP3/8/5P2 b K - 6 234 5P2/P2p2B1/1P2p3/4Q3/Pn6/6b1/7p/K7 b q g6 15 252 4P3/2N5/P6N/8/8/3P4/1P1K1p2/2p5 w - - 48 47 7P/1Nq5/6p1/4p3/1R6/3Q4/p1K5/2b5 w K g3 48 257 1P6/8/6Pp/8/1PnP1rP1/8/4r3/6p1 b Kk - 42 42 3p2n1/5K2/8/1bP5/7p/6RN/3R4/1p4N1 b Kq - 28 117 8/4N3/8/2r5/8/P7/2pkn2P/8 w kq - 8 107 6B1/2P5/8/7P/2p2N2/P7/2q4p/8 w Qq f3 39 260 6Pk/1p6/n7/8/4p1P1/1nR5/8/5p2 b k - 42 181 4p3/1P6/2PBp3/5k2/3R4/Q7/1pPB4/7P b Q h6 24 239 8/pP2K3/PnP1p2p/4n1B1/p3PP1p/1q1r4/7P/R4P2 w KQkq a6 13 6 2n1p3/1pP3Q1/8/PP6/2q4P/3p1B1B/1N2R2p/3b1Kk1 b q - 32 245 2kp4/pb5B/BN5R/6r1/8/P7/4Pnp1/p2N2p1 b q e6 20 197 2bB4/2b5/N7/1R3PpN/k7/5p2/3P2p1/p1q5 b Kq f6 36 202 8/3Np3/4p1B1/8/5P1p/3P4/p4Q2/2kq4 w Q - 6 165 8/3Bp3/2p5/5p1b/4k2p/8/7P/7p b KQkq g3 16 172 2B5/3rP3/1RRp3Q/3P4/4b1p1/5p1P/4P3/2q1p3 w KQkq - 29 45 1p5p/8/3Nk3/8/3P1nn1/Q7/4Pb2/3R4 b Kq - 13 100 P5p1/5PQ1/N7/qr2R1b1/7b/8/1B2p3/1n6 b Qq - 42 38 2p1p3/1B6/R4r2/4b3/8/4PP2/8/8 b - b6 45 255 2Q1r1k1/6B1/6P1/8/q5R1/8/4r3/1b2p3 w q d6 1 123 p3Kp2/7P/2N1P3/1b2n2P/4P3/8/8/1B5p w KQ - 46 144 K7/8/3p2r1/3N1p2/8/P3krB1/4P3/pP3p2 w KQ - 31 227 6pb/n4P2/2n1R3/8/6p1/r2p4/8/8 w KQkq e6 2 94 8/8/8/PB2N3/3Q4/2p4b/p6n/1pP4P w K - 29 204 2P5/R3BnK1/p4P1P/7r/7P/7p/7n/P7 w Qkq b3 9 97 1p3KP1/P4Pr1/P7/Bp4P1/p1k2p1p/1P6/8/5b2 w KQkq h6 29 153 1p3B2/3Pp3/1p3P2/1q1b3P/8/2n5/P7/p4NR1 b KQk e6 0 180 b7/4r3/3R1N1b/5R2/8/6N1/1p2p3/1p2n3 b KQk c3 4 150 8/3R4/5P2/5p2/B3r1QP/8/5p2/1k6 b - - 42 237 2B2p2/5p2/2p2P2/2p5/P7/3P3P/2QR4/Rp1PN3 w KQ e3 44 44 1P5P/Q4p2/8/4r3/R5P1/1P4p1/3b4/1P2n2p b K d6 47 160 5B2/3P3q/1P2RP1b/4p3/8/3P4/4p2p/6P1 w Kkq - 15 125 p7/P1p2p2/4b3/r1P1P3/N2N4/1p3P2/4BP2/8 w Kq f3 12 21 1r1p2P1/3N4/5Bp1/8/2Bb3K/nP2q3/2b2P2/1p2P3 b Qkq f3 29 248 1rP2p2/r2q4/3P2B1/2b4P/8/7P/8/p3p1n1 b KQq - 23 13 2P5/4B3/5p1N/4P3/pN1k1R2/Rp5r/5PQ1/2P5 b Kq h6 12 197 2R3P1/P1P5/3B4/5n2/3q4/4rp1K/7N/3N1p2 b kq a6 22 70 1r6/8/6K1/6P1/1B6/5PP1/P2pp3/1N6 b Qk e3 26 244 1PpP4/1P5P/p1P1nP2/Rbp5/r2k4/3nrPp1/4N3/8 w KQk h3 29 221 N2prp1p/1Pk1P3/8/7P/1K6/6n1/8/Q3Rp2 w KQ - 48 263 b3R3/P2b4/1P6/8/1N6/3PP3/4p2Q/p6n b Qk - 29 203 B4PRp/3N4/2r5/pP1P1b2/8/8/8/P7 w Q f6 43 242 2p3p1/2B5/k1n2R1R/6p1/P2K4/2P5/1P1PBp2/4P3 b Kk d6 28 248 3p3N/n5k1/b1r5/4P3/3r4/1R6/5Q2/6P1 w - g6 24 200 2P1r1n1/1P4p1/1b6/6PK/2p1p3/N3B3/2P5/Rr6 b KQkq a6 30 61 4P3/8/r1P1RP2/pk2q3/P1n4b/1KQ1N3/1B5p/8 w Qkq - 21 17 6pP/Q3rp2/8/5p2/4P3/4P3/1P2n1R1/2Pp3K b KQk - 40 6 n3p3/6Pp/6R1/3K2N1/6p1/1rP2B2/p5b1/1P1P1p2 b kq d6 23 196 8/P7/7p/2B5/6N1/2P1r3/n2Q4/5N2 w - - 6 95 P1Bb4/2p5/5Q2/8/3p2p1/4B3/4b3/3NK3 w Kkq d6 32 102 3p1pKk/p3p1bP/3n3r/3B4/2N1p3/4PP2/5B2/R4P2 b - - 25 9 1bP3B1/2n1k1N1/5pp1/8/7P/3p1p2/1Q5p/3P4 b KQq f3 34 253 3p1N2/2nr3R/Bk2n3/4P2p/3q3P/R7/2b5/PN2p3 w Kq h6 2 142 8/2Q3P1/8/2P3pp/8/6P1/3PK3/2p1q3 b Kk d3 27 168 6p1/1p3Q2/8/4P3/8/1p6/8/B7 b - - 29 266 8/3N1p1B/8/3pN3/r3p1P1/1P5B/8/q5r1 w KQq d3 21 21 4p3/6RP/3PKk2/1p6/p3BN1r/5N2/3p2qp/b7 b Qkq f3 11 143 5P1p/3r4/1Pk5/1Kp1Q1n1/5P1q/1p6/1P3B1R/3R4 b KQkq a3 12 30 2k1P3/1B6/q6P/6n1/1r1p2Kp/8/8/1R1p2P1 w q - 29 137 8/P2p4/8/5B2/1PP4Q/3N4/pn6/4p1P1 b KQkq h3 12 84 p1P4p/1B6/1P2r3/PP4b1/7R/q4p2/n4N2/7p b Qk f3 30 136 1K1b4/4N3/7Q/8/4p3/2P3P1/rr2pP2/7k b KQk - 32 207 nr3p2/8/5p2/P2P3b/6Pp/8/k7/3Q3R b KQkq - 11 1 2Pp1P1p/2p5/1pb5/6p1/3Q3q/6Nn/7B/6p1 b Kk a6 0 241 1P6/6r1/6p1/2p5/2p2B2/7K/8/1P6 w KQq f3 35 47 8/8/6P1/8/p4Np1/8/Q1N5/1p2B3 b - d6 17 192 2N4P/3r3p/1B4n1/8/2b1P1P1/1K6/1p5r/PQRp4 b Kk - 18 230 1R3p2/5n1P/1P4Qp/2N4p/8/2B4q/4P3/7k b Kkq - 48 147 8/8/8/1PP5/3Q4/6R1/1Bp1PP2/8 w - e3 23 26 4P3/5n2/r2p3p/8/1Rp3N1/8/2p5/K5P1 w KQkq - 27 28 2P5/6P1/P1R5/RP6/3r4/p5bp/4p3/6P1 b Kkq - 17 63'; preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0); // Print the entire match result var_dump($matches);

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