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

r"
"
gm

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

# If you'd like to omit non-matching lines from the result; add ';d' to the end of the expression. sed -E 's/(?=[a-zA-Z0-9\\/ \.\-]+\\/\\/:ptth) \././gm;t' <<< "nospmiS maC retroper lanruoJ teertS llaW edulcni repapswen eht fo inmula elbatoN lmths .7665401-09.snruT .sweN-ehT/sweN/40/11/5002/swen/903repap/egarots/aidem/moc .swenned .www .aidem//:ptth .0891 ni nesohc saw eman tnerruc sti erofeb sweN etatS nretsaE dna sweN egelloC s'rehcaeT demaner saw repap ehT .repapswen yliad a evah ot yrtnuoc eht ni seitisrevinu tsellams eht fo eno si dna 2999031 .1-sserp-lles-ot-setov-draob-aidem-tneduts/seirots-pot/moc .enilnonaxetyliad .www//:ptth sserp gnitnirp repapswen nwo sti nur ot setatS detinU eht ni seitisrevinu eerht ylno fo eno si ytisrevinU sionillI nretsaE"

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 SED, please visit: https://www.gnu.org/software/sed/manual/html_node/The-_0022s_0022-Command.html