Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python 2.7
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/
http[^#\?]+[^\d](\d{4,7})[^-\d\w]*
/
gm
http matches the characters http literally (case sensitive)
Match a single character not present in the list below
[^#\?]+
+ Quantifier — Matches between one 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)
Match a single character not present in the list below
[^\d]
\d matches a digit (equal to [0-9])
1st Capturing Group
(\d{4,7})
\d{4,7}
matches a digit (equal to [0-9])
{4,7} Quantifier — Matches between 4 and 7 times, as many times as possible, giving back as needed (greedy)
Match a single character not present in the list below
[^-\d\w]*
* Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)
- matches the character - literally (case sensitive)
This hyphen is treated literally, which might be confusing for others. Consider escaping it or placing at the start or end of the class!
\d matches a digit (equal to [0-9])
\w matches any word character (equal to [a-zA-Z0-9_])
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

Regular Expressions 101

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