regex101: PCRE (Legacy) Match Workspace

Pro

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/?optionally matches the literal / (47₁₀ / 57₈ / 2F₁₆)

\s*any whitespace character, repeated any number of times

\ban ASCII word boundary

Uses the first branch if the lookaround matches

Positive Lookahead(?=a)

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

?repeats the group contents below at most once:

1st Alternativebbr

bbrthe literal text bbr (case sensitive)

2nd Alternativecronym

cronymthe literal text cronym (case sensitive)

3rd Alternativeddress

ddressthe literal text ddress (case sensitive)

4th Alternativepplet

ppletthe literal text pplet (case sensitive)

5th Alternativer(?:ea|ticle)

rthe literal r (114₁₀ / 162₈ / 72₁₆) (case sensitive)

Non-Capturing Group(?:ea|ticle)

1st Alternativeea

eathe literal text ea (case sensitive)

2nd Alternativeticle

ticlethe literal text ticle (case sensitive)

6th Alternativeside

sidethe literal text side (case sensitive)

7th Alternativeudio

udiothe literal text udio (case sensitive)

Uses the first branch if the lookaround matches

Positive Lookahead(?=b)

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive)

If the condition is true, match this branch:b(?:ase|asefont|d[io]|ig|lockquote|ody|r|utton)?

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive)

Non-Capturing Group(?:ase|asefont|d[io]|ig|lockquote|ody|r|utton)?

?repeats the group contents below at most once:

1st Alternativease

asethe literal text ase (case sensitive)

2nd Alternativeasefont

asefontthe literal text asefont (case sensitive)

3rd Alternatived[io]

dthe literal d (100₁₀ / 144₈ / 64₁₆) (case sensitive)

Character Class[io]

ithe literal i (105₁₀ / 151₈ / 69₁₆) (case sensitive)

othe literal o (111₁₀ / 157₈ / 6F₁₆) (case sensitive)

4th Alternativeig

igthe literal text ig (case sensitive)

5th Alternativelockquote

lockquotethe literal text lockquote (case sensitive)

6th Alternativeody

7th Alternativer

8th Alternativeutton

\ban ASCII word boundary

Global pattern flags

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

25 tokens

Regular Expression

<\/?\s*\b(?(?=a)a(?:bbr|cronym|ddress|pplet|r(?:ea|ticle)|side|udio)?|(?(?=b)b(?:ase|asefont|d[io]|ig|lockquote|ody|r|utton)?|(?(?=c)c(?:anvas|aption|enter|ite|ode|ol(?:group)?)|(?(?=d)d(?:ata(?:list)?|[dlt]|el|etails|fn|ialog|i[rv])|(?(?=e)em(?:bed)?|(?(?=f)f(?:i(?:eldset|g(?:caption|ure))|o(?:nt|oter|rm)|rame(?:set)?)|(?(?=h)h(?:[1-6r]|ead(?:er)?|tml)|(?(?=i)i(?:frame|mg|nput|ns)?|(?(?=k)kbd|(?(?=l)l(?:abel|egend|i(?:nk)?)|(?(?=m)m(?:a(?:in|p|rk)|et(?:a|er))|(?(?=n)n(?:av|o(?:frames|script))|(?(?=o)o(?:bject|l|pt(?:group|ion)|utput)|(?(?=p)p(?:aram|icture|re|rogress)?|(?(?=q)q|(?(?=r)r[pt]|(?(?=r)ruby|(?(?=s)s|(?(?=s)s(?:amp|ection|elect|mall|ource|pan|trike|trong|tyle|ub|ummary|up|vg)|(?(?=t)t(?:able|body|[dhrt]|emplate|extarea|foot|head|ime|itle|rack)|(?(?=u)ul?|(?(?=v)v(?:ar|ideo)|wbr))))))))))))))))))))))\b

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Regular Expressions 101

Regular Expression

Substitution