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"
"
g

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"([a-zA-Z]+)[\s\-\.]+(\d{1,2})[\s\-\,]+(\d{4})" test_str = ("04/20/2009; 04/20/09; 4/3/09 7/8/71\n" "Mar-20-2009; Mar 20, 2009; March 20, 2009; Mar. 20, 2009; Mar 20 2009\n" "20 Mar 2009; 20 March 2009; 20 Mar. 2009; 20 March, 2009\n" "Mar 20th, 2009; Mar 21st, 2009; Mar 22nd, 2009\n" "Feb 2009; Sep 2009; Oct 2010\n" "6/2008; 12/2009\n" "6/1998 Primary Care Doctor:\n" "2009; 2010\n" "(4/10/71)Score-1Audit C Score Current: 9/27/75. \n" "1; 10/13/1976 Audit C Score,\n" "4-13-82 Other Child Mental occasion 5/21/77.\n" "1; 10/13/1976 Audit C\n" "(1988-now)\n" "B12 969 2007\n" "Lab: B12 969 2007\n" "Ely 708-810-7787 \n" "February, 2010\n" "URUGUAY September 1984.\n" "7HH, April 1985 Hx of Outpatient\n" "Venlafaxine 37.5mg daily: May, 2011: self-discontinued\n" ") Paxil (Jan 1978) : sedation\n" "LFTs WNL (October 1996)Problems Opioid dependence\n" "\"I wasn't getting anywhere\" (April 1988)Prior\n" "Prozac 20 mg daily: February, 1995: self-discontinued\n" "sLexapro (1988-now): Good response (anxiety)\n" "pOct 2015 - Admitted to Gray\n" "lNovember 1990 - NPCCHx of Outpatient Treatment: Yes") matches = re.finditer(regex, test_str) for matchNum, match in enumerate(matches, start=1): print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group())) for groupNum in range(0, len(match.groups())): groupNum = groupNum + 1 print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.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