regex101: PCRE (Legacy) Match Workspace

\ban ASCII word boundary

Group 1(https?:\/\/\S*?\.(?:png|jpe?g|gif) # allowed postfixes to the filetype (?:\?(?: # alphnumeric key/value pairs (?:(?:[\w_-]+=[\w_-]+)(?:&[\w_-]+=[\w_-]+)*)| # alphnumeric postfix (?:[\w_-]+) ))? )

httpthe literal text http (case insensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case insensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\S*?any non-whitespace character, repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:png|jpe?g|gif)

1st Alternativepng

pngthe literal text png (case insensitive)

2nd Alternativejpe?g

jpthe literal text jp (case insensitive)

e?optionally matches the literal e (101₁₀ / 145₈ / 65₁₆) (case insensitive)

gthe literal g (103₁₀ / 147₈ / 67₁₆) (case insensitive)

3rd Alternativegif

gifthe literal text gif (case insensitive)

Comment: allowed postfixes to the filetype

Non-Capturing Group(?:\?(?: # alphnumeric key/value pairs (?:(?:[\w_-]+=[\w_-]+)(?:&[\w_-]+=[\w_-]+)*)| # alphnumeric postfix (?:[\w_-]+) ))?

?repeats the group contents below at most once:

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

Non-Capturing Group(?: # alphnumeric key/value pairs (?:(?:[\w_-]+=[\w_-]+)(?:&[\w_-]+=[\w_-]+)*)| # alphnumeric postfix (?:[\w_-]+) )

1st Alternative # alphnumeric key/value pairs (?:(?:[\w_-]+=[\w_-]+)(?:&[\w_-]+=[\w_-]+)*)

Comment: alphnumeric key/value pairs

Non-Capturing Group(?:(?:[\w_-]+=[\w_-]+)(?:&[\w_-]+=[\w_-]+)*)

Non-Capturing Group(?:[\w_-]+=[\w_-]+)

Character Class[\w_-]+

+matches at least one character from the set below:

\wany word character

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Character Class[\w_-]+

+matches at least one character from the set below:

\wany word character

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:&[\w_-]+=[\w_-]+)*

*repeats the group contents below any number of times:

&the literal & (38₁₀ / 46₈ / 26₁₆)

Character Class[\w_-]+

+matches at least one character from the set below:

\wany word character

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Character Class[\w_-]+

+matches at least one character from the set below:

\wany word character

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

2nd Alternative # alphnumeric postfix (?:[\w_-]+)

Comment: alphnumeric postfix

Non-Capturing Group(?:[\w_-]+)

Character Class[\w_-]+

+matches at least one character from the set below:

\wany word character

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\ban ASCII word boundary

Global pattern flags

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

Search reference

Regular Expression

\b(https?:\/\/\S*?\.(?:png|jpe?g|gif)
  # allowed postfixes to the filetype
  (?:\?(?:
    # alphnumeric key/value pairs
    (?:(?:[\w_-]+=[\w_-]+)(?:&[\w_-]+=[\w_-]+)*)|
    # alphnumeric postfix
    (?:[\w_-]+)
  ))?
)\b

New

http://well-being.esdc.gc.ca/misme-iowb/auto/diagramme-chart/stg2/c_4_21_6_1_eng.png?20150508104424447 This is arbitrary text http://a-link-to-ignore https://scontent-lga1-1.xx.fbcdn.net/hphotos-xtf1/v/t1.0-9/11147160_10156300867440377_5455334309678688318_n.jpg?oh=916e68ac2c908bbe15961825c373d6bc&oe=5606B6F4 this is arbitrary text

http://lh6.ggpht.com/-1Rua79J-EDo/TwuyZkHwcmI/AAAAAAAADvA/ENfg1TeayvU/type_catalog_error_thumb%25255B1%25255D.jpg?imgmax=800 this is arbitrary text http://image.slidesharecdn.com/top5thingstodoafteranaccident-140826163850-phpapp02/95/top-five-things-to-do-after-any-type-of-accident-causing-injury-1-638.jpg?cb=1409089267