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

/
/

Test String

Code Generator

Language

Generated Code

# coding=utf8 # the above tag defines encoding for this document and is for Python 2.x compatibility import re regex = r"Tasks: (\d+) total, (\d+) running, (\d+) sleeping, (\d+) stopped, (\d+) zombie" test_str = ("top - 11:41:04 up 21 min, 1 user, load average: 0.00, 0.01, 0.07\n" "Tasks: 86 total, 1 running, 85 sleeping, 0 stopped, 0 zombie\n" "%Cpu(s): 4.7 us, 2.2 sy, 0.5 ni, 92.0 id, 0.3 wa, 0.0 hi, 0.3 si,\n" "KiB Mem: 501692 total, 475348 used, 26344 free, 13032 buffers\n" "KiB Swap: 0 total, 0 used, 0 free. 281204 cached\n\n" " PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+\n" " 1 root 20 0 33632 2940 1468 S 0.0 0.6 0:01.87\n" " 2 root 20 0 0 0 0 S 0.0 0.0 0:00.01\n" "...\n" "17836 www-data 20 0 287448 6708 2424 S 0.0 1.3 0:00.02\n" "17914 vagrant 20 0 23528 1396 1048 R 0.0 0.3 0:00.00") matches = re.search(regex, test_str) if matches: print ("Match was found at {start}-{end}: {match}".format(start = matches.start(), end = matches.end(), match = matches.group())) for groupNum in range(0, len(matches.groups())): groupNum = groupNum + 1 print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = matches.start(groupNum), end = matches.end(groupNum), group = matches.group(groupNum))) # Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.

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 Python, please visit: https://docs.python.org/3/library/re.html