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

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"\b(?:BP:?(?:-Sitting)?|Blood Pressure) \d+/\d+(?: \d+/\d+| \d+/\d+)*(?: sm| -Lw| cB| Jr|\\n" r" -aA| cs| -ic| ic| -RG| kA| -sL| BL| kc| am| -sH| sH| es| ts| np| 8s| ca| Pm| JE| so| cp| v8| Eu| -cp|\\n" r" Pm| EB| Fr| -Fr| -ms| -LN| -mT| -mk| -GF| -HO| Jp| wD| 8m| mc| -mc| Yr| -Lp| -ml| -LA| s/d| -aA| s/d|mmHg| mm Hg|\\n" r" mm hg.|.?)?|B/P - (?:Sys|Dias)tolic \d+|(?:Sys|Dias)tolic Blood Pressure \d+ \w+\b|(?<=Recorded )\d{1,2}[A-Za-z]{3}\d{4}\b|\d{1,2}/\d{1,2}/\d{2,}\b(?= BP| Blood Pressure)") test_str = ("Weight: 188 lbs ,Wt 124 Ib (56.2 kg) ,Height: 108.2 cm Weight: 20.9 kg BMI: 18 Lives with Father, Mother. ,Vials BP 120/75 Hu 52\" We 202 I (916 kg) BMI 36.95 kg/m 354 2 mi ,W197 Ib 8 oz (44.2 kg) SpO2 99% BMI 19.69 kg/m2 BSA 1.36 m2 ,Weight 316kg ,HT: 160 cm WT: 79.6 kg BMI: 31.09 ,Blood Pressure 106/63 02/27/2019,B/P - Systolic 104,B/P - Diastolic 72,BP-Sitting 109/70 mmHg,BP: 101/72 left arm, normal cuff, seated 123/76 on 09/25/2018,Systolic Blood Pressure 100 mmHg,Diastolic Blood Pressure 68 mmHg,BP 128/80 128/81 128/82 128/83,Pain scale 0 1-10 Oxygen sat % 95 % HR 83 /min BP 144/68 mm Hg Ht , . _ Repeat BP 130/80.Just now feeling she is sure she is feeling FM.Plans to bottlefeed ,Blood Pressure 106/64s/d 78th / 77th percentileqyy Left Arm Sitting ,Blood Pressure 114/76 s/d 77th 7 goth percentileqyyy Right Arm Sitting ,BP 130/82mmHg Pulse 78 Ht 1.753 m 5' 9\" Wt 78.019 kg 172 Ib BMI 25.39 kg/m2 ,BP 142/70 sm ,BP 129/87 -Lw ,BP 120/74 cB ,BP 150/80 Jr ,BP 128/80 104/58 120/84 136/78 ,nan,\n\n\n\n" "07/20/18 Blood Pressure 112/54 , BP 10/30/17 1345 178/80 ,Name 06/22/2018 06/22/2018 Blood Pressure 120/68 ,4/6/2015 BP 132/69 Patient Position ,nan,nan, Blood Pressure 150/88 Recorded 08Dec2017 02 49PM , Blood Pressure 150/88 Recorded 08Dec2017 02 49PM , Blood Pressure 140/88 Recorded 15Nov2017 03 21PM") matches = re.finditer(regex, test_str, re.MULTILINE) 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