Regular Expressions 101

Save & Manage Regex

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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
Processing...

Test String

Substitution
Processing...

Code Generator

Language

Generated Code

re = /^(?P<name>[a-zA-Z0-9&@\-\.\,\(\)\[\} ]*)[ \t]*(?P<language>[A-Z]{1})[\t ]*(?P<lab_info>\0|[a-zA-Z0-9&@\.\,\(\)\[\} ]*)[ \t]*[-]{0,1}[ \t]*(?P<day>\d{2})\/(?P<month>\d{2})\/(?P<year>\d{4})[,][ \t]*(?P<day_in_words>[a-zA-Z]*)[ \t]*(?P<from>\d{2}[:]\d{2})[ \t]*[-][ \t]*(?P<to>\d{2}[:]\d{2})[ \t]*(?P<center>[a-zA-Z0-9&@\-\.\,\(\)\[\}]*)[ \t]*/m str = 'Day School 1 E - 18/02/2018, Sun 15:30 - 17:30 CL Day School 1 E - 20/02/2018, Tue 10:30 - 12:30 KN Lab 1 E CLE01 24/05/2018, Thu 09:30 - 16:30 CL Lab 1 E KNE01 14/06/2018, Thu 09:30 - 16:30 KN CA-Test 1 E - 12/07/2018, Thu 12:00 - 13:15 RC Day School 2 E - 28/07/2018, Sat 13:00 - 15:00 KN Day School 2 E - 28/07/2018, Sat 13:00 - 15:00 CL Day School 3 E - 28/07/2018, Sat 15:00 - 17:30 CL Day School 3 E - 28/07/2018, Sat 15:30 - 17:30 KN Lab 2 E CLE01 03/08/2018, Fri 09:30 - 16:30 CL Lab 2 E KNE01 04/09/2018, Tue 09:30 - 16:30 KN CA-Test 2 E - 06/10/2018, Sat 12:00 - 13:15 RC Tutor Marked Assignment Due 1 E - 17/10/2018, Wed 09:30 - 16:30 CL Lab 3 E CLE01 24/10/2018, Wed 09:30 - 16:30 CL Lab 3 E KNE01 02/11/2018, Fri 09:30 - 16:30 KN Day School 4 E - 04/11/2018, Sun 15:30 - 17:30 CL Day School 4 E - 09/11/2018, Fri 13:00 - 15:00 KN Lab Evaluation 1 E - 29/11/2018, Thu 09:30 - 12:30 CL Final Examination 1 E - 27/01/2019, Sun 09:30 - 12:30 RC AGI3535 Land and soil tillage management Eligibility Criteria : AVG(CAT)0.5 + (TMA)0.1 + AVG(LAB)0.4 >= 40 AVG(LAB)1 >= 40 Note : *AVG(LAB)=(LAB Reports)0.4+(Lab Evaluation)0.6 Academic Coordinator/s : Ms. B.S.G. Chandrasekera 0112881442 / 442 bscha@ou.ac.lk Course Coordinator/s : Activity Description M Group Date Time Centre Day School 1 E - 18/02/2018, Sun 08:00 - 10:00 KN 2 [AGI3535 Land and soil tillage management] Day School 1 E - 18/02/2018, Sun 08:00 - 10:00 CL Lab 1 E CLE01 04/06/2018, Mon 09:30 - 16:30 CL Lab 1 E KNE01 12/06/2018, Tue 09:30 - 16:30 KN CA-Test 1 E - 14/07/2018, Sat 09:00 - 10:15 RC Day School 2 E - 18/08/2018, Sat 08:00 - 10:00 KN Day School 2 E - 18/08/2018, Sat 08:00 - 10:00 CL Lab 2 E CLE01 30/08/2018, Thu 09:30 - 16:30 CL Lab 2 E KNE01 07/09/2018, Fri 09:30 - 16:30 KN CA-Test 2 E - 07/10/2018, Sun 09:00 - 10:15 RC Tutor Marked Assignment Due 1 E - 17/10/2018, Wed 09:30 - 16:30 CL Day School 3 E - 24/11/2018, Sat 13:00 - 15:00 CL Day School 3 E - 24/11/2018, Sat 13:00 - 15:00 KN Lab 3 E CLE01 26/11/2018, Mon 09:30 - 16:30 CL Lab 3 E KNE01 27/11/2018, Tue 09:30 - 16:30 KN Lab Evaluation 1 E - 30/11/2018, Fri 09:30 - 12:30 CL Final Examination 1 E - 14/01/2019, Mon 09:30 - 12:30 RC AGI3536 Post-harvest biology and technology I Eligibility Criteria : AVG(CAT)0.5 + (TMA)0.1 + AVG(LAB)0.4 >= 40 AVG(LAB)1 >= 40 Note : *AVG(LAB)=(LAB Reports)0.4+(Lab Evaluation)0.6 Academic Coordinator/s : Mr.P. K. J. de Mel ext. 396 / 0112881396 pkmel@ou.ac.lk Course Coordinator/s : Miss.M. D. Jayasinghe 442 / 0112881442 mdjayasinghe91@gmail.com Activity Description M Group Date Time Centre Day School 1 E - 23/06/2018, Sat 10:30 - 12:30 KN Day School 1 E - 23/06/2018, Sat 10:30 - 12:30 CL Lab 1 E - 25/06/2018, Mon 09:30 - 16:30 CL Lab 1 E - 26/06/2018, Tue 09:30 - 16:30 KN CA-Test 1 E - 17/07/2018, Tue 09:00 - 10:15 RC Day School 2 E - 19/08/2018, Sun 10:30 - 12:30 KN Day School 2 E - 19/08/2018, Sun 10:30 - 12:30 CL Lab 2 E - 23/08/2018, Thu 09:30 - 16:30 CL Lab 2 E - 31/08/2018, Fri 09:30 - 16:30 KN CA-Test 2 E - 09/10/2018, Tue 09:00 - 10:15 RC Tutor Marked Assignment Due 1 E - 17/10/2018, Wed 09:30 - 12:30 CL Day School 3 E - 04/11/2018, Sun 10:30 - 12:30 KN Day School 3 E - 04/11/2018, Sun 10:30 - 12:30 CL Lab 3 E - 22/11/2018, Thu 09:30 - 16:30 CL Lab 1 (Session 2) E CLE05 25/05/2018, Fri 09:00 - 16:00 CL Day School 2 E - 26/05/2018, Sat 10:30 - 12:30 CL Lab 1 E CLE06 11/06/2018, Mon 09:00 - 16:00 CL Lab 1 (Session 2) E CLE06 12/06/2018, Tue 09:00 - 16:00 CL Lab 1 E CLE07 14/06/2018, Thu 09:00 - 16:00 CL Lab 1 (Session 2) E CLE07 15/06/2018, Fri 09:00 - 16:00 CL Lab 1 E CLE08 18/06/2018, Mon 09:00 - 16:00 CL Lab 1 (Session 2) E CLE08 19/06/2018, Tue 09:00 - 16:00 CL CA-Test 1 E - 17/07/2018, Tue 12:00 - 13:15 RC Lab 1 E CLE09 25/07/2018, Wed 09:00 - 16:00 CL Lab 1 (Session 2) E CLE09 26/07/2018, Thu 09:00 - 16:00 CL Lab 1 E CLE10 30/07/2018, Mon 09:00 - 16:00 CL Lab 1 (Session 2) E CLE10 31/07/2018, Tue 09:00 - 16:00 CL Lab 1 E CLE11 02/08/2018, Thu 09:00 - 16:00 CL Lab 1 (Session 2) E CLE11 03/08/2018, Fri 09:00 - 16:00 CL Tutor Marked Assignment Due 1 E - 03/08/2018, Fri 09:00 - 16:00 CL Lab 1 E CLE12 09/08/2018, Thu 09:00 - 16:00 CL Lab 1 (Session 2) E CLE12 10/08/2018, Fri 09:00 - 16:00 CL Lab 1 E CLE13 16/08/2018, Thu 09:00 - 16:00 CL Lab 1 (Session 2) E CLE13 17/08/2018, Fri 09:00 - 16:00 CL Lab 1 E CLE15 22/08/2018, Wed 09:00 - 16:00 CL Lab 1 E CLE14 23/08/2018, Thu 09:00 - 16:00 CL Lab 1 (Session 2) E CLE15 23/08/2018, Thu 09:00 - 16:00 CL Lab 1 (Session 2) E CLE14 24/08/2018, Fri 09:00 - 16:00 CL Lab 1 E CLE16 03/09/2018, Mon 09:00 - 16:00 CL Lab 1 (Session 2) E CLE16 04/09/2018, Tue 09:00 - 16:00 CL Lab 1 E CLE17 06/09/2018, Thu 09:00 - 16:00 CL Lab 1 (Session 2) E CLE17 07/09/2018, Fri 09:00 - 16:00 CL Day School 3 E - 22/09/2018, Sat 10:30 - 12:30 CL Lab 1 E CLE18 01/10/2018, Mon 09:00 - 16:00 CL Lab 1 (Session 2) E CLE18 02/10/2018, Tue 09:00 - 16:00 CL Lab 1 E CLE19 03/10/2018, Wed 09:00 - 16:00 CL Lab 1 (Session 2) E CLE19 04/10/2018, Thu 09:00 - 16:00 CL CA-Test 2 E - 09/10/2018, Tue 12:00 - 13:15 RC Lab 1 E CLE20 29/10/2018, Mon 09:00 - 16:00 CL Lab 1 (Session 2) E CLE20 30/10/2018, Tue 09:00 - 16:00 CL Tutor Marked Assignment Due 2 E - 02/11/2018, Fri 09:00 - 16:00 CL Online Quiz 1 E - 15/12/2018, Sat 08:00 - 17:30 CL Day School 4 E - 05/01/2019, Sat 10:30 - 12:30 CL Final Examination 1 E - 06/02/2019, Wed 09:30 - 12:30 RC DMX4571 Sensors and actuators 144 [DMX4571 Sensors and actuators] Eligibility Criteria : 1B(CAT)0.35 + 2B(CAT)0.15 + AVG(TMA)0.3 + (LAB)0.2 >= 40 (LAB)1 >= 50 Academic Coordinator/s : ' subst = '' result = str.gsub(re, subst) # Print the result of the substitution puts result

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 Ruby, please visit: http://ruby-doc.org/core-2.2.0/Regexp.html