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"create table (\w+)\([\s\S]+?(?=\)(?:\n|$))" test_str = ("create table sous_branche(\n" " id_sous_branche integer not null,\n" " code_sous_branche character varying(20) not null,\n" " libelle_sous_branche character varying(55) not null,\n" " designation_sous_branche character varying(255) null,\n" " taux_taxes float null,\n" " date_creation timestamp without time zone null,\n" " ref_importation integer null,\n" " date_importation timestamp without time zone null\n" ")\n" "go\n" "-- **** object: table caisse script date: 30/06/2015 16:53:15 ****\n" "create table operation_caisse(\n" " id_operation_caisse integer not null,\n" " operation_id integer not null,\n" " mode_paiement_id integer not null, --id_mode_paiement\n" " libelle_paiement_caisse_id integer not null, --id_libelle_paiement\n" " jour_imputation timestamp without time zone null,\n" " date_paiement_caisse timestamp without time zone null,\n" " numero_reglement integer null,\n" " libelle_operation_caisse character varying(55) not null,\n" " montant_operation_caisse double precision null,\n" " payeur_effet_caisse_id integer not null, --id_payeur_effet\n" " numero_effet_caisse character varying(30) null,\n" " titulaire_compte_effet_caisse character varying(55) null,\n" " date_encaissement_effet_caisse timestamp without time zone null,\n" " autres_informations_caisse text null,\n" " valider_commissionnement_caisse bit not null,\n" " commissions_a_debiter_caisse real null,\n" " numero_piece_caisse character varying(30) null,\n" " piece_caisse_annulee bit not null,\n" " date_annulation_piece_caisse timestamp without time zone null,\n" " reference_annulation_piece_caisse character varying(55) null,\n" " date_creation timestamp without time zone null,\n" " ref_importation integer null,\n" " date_importation timestamp without time zone null\n" ")") 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