Regular Expressions 101

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/
<p>(.*)<\/p>\s*<\/div>\s*<p\s+class=".*">XXXX<\/p>\s*<div\s+class=".*">\s*<p(\s+class=".*")?\s+id=".*">(.*)<\/p>
/
gm
<p> matches the characters <p> literally (case sensitive)
1st Capturing Group
(.*)
.
matches any character (except for line terminators)
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
< matches the character < literally (case sensitive)
\/ matches the character / literally (case sensitive)
p> matches the characters p> literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
< matches the character < literally (case sensitive)
\/ matches the character / literally (case sensitive)
div> matches the characters div> literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
<p matches the characters <p literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
class=" matches the characters class=" literally (case sensitive)
.
matches any character (except for line terminators)
">XXXX< matches the characters ">XXXX< literally (case sensitive)
\/ matches the character / literally (case sensitive)
p> matches the characters p> literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
<div matches the characters <div literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
class=" matches the characters class=" literally (case sensitive)
.
matches any character (except for line terminators)
"> matches the characters "> literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
<p matches the characters <p literally (case sensitive)
2nd Capturing Group
(\s+class=".*")?
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
id=" matches the characters id=" literally (case sensitive)
.
matches any character (except for line terminators)
"> matches the characters "> literally (case sensitive)
3rd Capturing Group
(.*)
< matches the character < literally (case sensitive)
\/ matches the character / literally (case sensitive)
p> matches the characters p> literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String

Substitution

Processing...