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

/
/
gm

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

re = /^(?=\S.+\nCoverage\sLevel)|^(?=\S.+\nNon-Covered\s)/m str = 'Out of Pocket (Stop Loss) Coverage Level: Individual Service Type: Health Benefit Plan Coverage Insurance Type Code: HM Health Maintenance Organization (HMO) Time Period Qualifier: Calendar Year Amount: $8,500.00 In Plan Network Indicator: Unknown Deductible Coverage Level: Individual Service Type: Vision (Optometry) https://luna.ema.md/ema/patient/InsuranceOverviewForm.action?pic1.0u85-w2bBh0R86_K9v71KolpMN1sZmZ0Lxolu1TW4qD3al-JJFDVNX81... 13/172/21/22, 10:26 AM Luna Dermatology: Patient Insurance Insurance Type Code: HM Health Maintenance Organization (HMO) Plan Coverage Description: Fidelis Care Silver Amount: $0.00 Authorization/Certification Req\'d: No In Plan Network Indicator: no Co-Payment Coverage Level: Individual Service Type: Vision (Optometry) Insurance Type Code: HM Health Maintenance Organization (HMO) Plan Coverage Description: Fidelis Care Silver Amount: $0.00 Authorization/Certification Req\'d: No In Plan Network Indicator: Yes Co-Insurance Coverage Level: Individual Service Type: Vision (Optometry) Insurance Type Code: HM Health Maintenance Organization (HMO) Plan Coverage Description: Fidelis Care Silver Authorization/Certification Req\'d: No In Plan Network Indicator: Unknown Out of Pocket (Stop Loss) Coverage Level: Family Service Type: Health Benefit Plan Coverage Insurance Type Code: HM Health Maintenance Organization (HMO) Time Period Qualifier: Remaining Amount: $16,190.82 In Plan Network Indicator: Unknown Non-Covered Coverage Level: Individual Service Type: Medical Care Insurance Type Code: HM Health Maintenance Organization (HMO) Plan Coverage Description: Fidelis Care Silver In Plan Network Indicator: No Message: Medical Care Non-Covered Coverage Level: Individual Service Type: Durable Medical Equipment Purchase Insurance Type Code: HM Health Maintenance Organization (HMO) Plan Coverage Description: Fidelis Care Silver In Plan Network Indicator: No Message: DME Purchase' subst = '\\n' 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