regex101: PCRE (Legacy) Substitution Workspace

Group 1((?<=[a-zA-Z0-9={}])\s+(?=[a-zA-Z0-9={}(])|[\n\r]+|(?<=[{}])|(?=[{}])|(?<=[=])|(?=[=]))

1st Alternative(?<=[a-zA-Z0-9={}])\s+(?=[a-zA-Z0-9={}(])

Positive Lookbehind(?<=[a-zA-Z0-9={}])

Character Class[a-zA-Z0-9={}]

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

\s+any whitespace character, repeated at least once

Positive Lookahead(?=[a-zA-Z0-9={}(])

Character Class[a-zA-Z0-9={}(]

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

(the literal ( (40₁₀ / 50₈ / 28₁₆)

2nd Alternative[\n\r]+

Character Class[\n\r]+

+matches at least one character from the set below:

\na line-feed (newline) character (ASCII 10)

\ra carriage return (ASCII 13)

3rd Alternative(?<=[{}])

Positive Lookbehind(?<=[{}])

Character Class[{}]

{the literal { (123₁₀ / 173₈ / 7B₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

4th Alternative(?=[{}])

Positive Lookahead(?=[{}])

Character Class[{}]

{the literal { (123₁₀ / 173₈ / 7B₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

5th Alternative(?<=[=])

Positive Lookbehind(?<=[=])

Character Class[=]

=the literal = (61₁₀ / 75₈ / 3D₁₆)

6th Alternative(?=[=])

Positive Lookahead(?=[=])

Character Class[=]

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Positive Lookahead(?=(?:[^"]*"[^"]*")*[^"]*$)

Non-Capturing Group(?:[^"]*"[^"]*")*

*repeats the group contents below any number of times:

Negated Character Class[^"]*

*matches any number of characters outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

Negated Character Class[^"]*

*matches any number of characters outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

Negated Character Class[^"]*

*matches any number of characters outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

$end of line

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

Search reference

Regular Expression

((?<=[a-zA-Z0-9={}])\s+(?=[a-zA-Z0-9={}(])|[\n\r]+|(?<=[{}])|(?=[{}])|(?<=[=])|(?=[=]))(?=(?:[^"]*"[^"]*")*[^"]*$)

New

print "hello"
print "x+2 / 5 = 3"

Substitution

\n