core: add support of flags in regular expressions and highlight options, add irc options to customize/disable default nick highlight (task #11128)

New functions in C plugin API:
- string_regex_flags
- string_regcomp

New irc options:
- irc.look.highlight_server
- irc.look.highlight_channel
- irc.look.highlight_pv

Regex flags are supported in following options/commands:
- option weechat.look.highlight
- option weechat.look.highlight_regex
- options irc.look.highlight_{server|channel|pv}
- option relay.network.allowed_ips
- core command /filter
- irc command /list
- irc command /ignore
- rmodifier command /rmodifier

6 files changed, 23 insertions, 5 deletions

diff --git a/doc/en/autogen/user/irc_commands.txt b/doc/en/autogen/user/irc_commands.txt
index 42316c583..3d13c4263 100644
--- a/doc/en/autogen/user/irc_commands.txt
+++ b/doc/en/autogen/user/irc_commands.txt
@@ -172,6 +172,8 @@ reason: reason for quit
    server: internal server name where ignore is working
   channel: channel name where ignore is working
 
+Note: the regular expression can start with "(?-i)" to become case sensitive.
+
 Examples:
   ignore nick "toto" everywhere:
     /ignore add toto
@@ -272,7 +274,7 @@ server_mask: list of servers must match this mask
 
 channel: channel to list
  server: server name
-  regex: regular expression used to filter results
+  regex: regular expression used to filter results (case insensitive, can start by "(?-i)" to become case sensitive)
 
 Examples:
   list all channels on server (can be very slow on large networks):
diff --git a/doc/en/autogen/user/irc_options.txt b/doc/en/autogen/user/irc_options.txt
index d2cfb689b..c8b91b08e 100644
--- a/doc/en/autogen/user/irc_options.txt
+++ b/doc/en/autogen/user/irc_options.txt
@@ -158,6 +158,21 @@
 ** type: boolean
 ** values: on, off (default value: `on`)
 
+* [[option_irc.look.highlight_channel]] *irc.look.highlight_channel*
+** description: `comma separated list of words to highlight in channel buffers (case insensitive, use "(?-i)" at beginning of words to make them case sensitive; special variables $nick, $channel and $server are replaced by their value), these words are added to buffer local variable "highlight_words" only when buffer is created (it does not affect current buffers), an empty string disables default highlight on nick, examples: "$nick", "(?-i)$nick"`
+** type: string
+** values: any string (default value: `"$nick"`)
+
+* [[option_irc.look.highlight_pv]] *irc.look.highlight_pv*
+** description: `comma separated list of words to highlight in private buffers (case insensitive, use "(?-i)" at beginning of words to make them case sensitive; special variables $nick, $channel and $server are replaced by their value), these words are added to buffer local variable "highlight_words" only when buffer is created (it does not affect current buffers), an empty string disables default highlight on nick, examples: "$nick", "(?-i)$nick"`
+** type: string
+** values: any string (default value: `"$nick"`)
+
+* [[option_irc.look.highlight_server]] *irc.look.highlight_server*
+** description: `comma separated list of words to highlight in server buffers (case insensitive, use "(?-i)" at beginning of words to make them case sensitive; special variables $nick, $channel and $server are replaced by their value), these words are added to buffer local variable "highlight_words" only when buffer is created (it does not affect current buffers), an empty string disables default highlight on nick, examples: "$nick", "(?-i)$nick"`
+** type: string
+** values: any string (default value: `"$nick"`)
+
 * [[option_irc.look.highlight_tags]] *irc.look.highlight_tags*
 ** description: `comma separated list of tags for messages that may produce highlight (usually any message from another user, not server messages,..)`
 ** type: string
diff --git a/doc/en/autogen/user/relay_options.txt b/doc/en/autogen/user/relay_options.txt
index e11887a88..a3cf672c9 100644
--- a/doc/en/autogen/user/relay_options.txt
+++ b/doc/en/autogen/user/relay_options.txt
@@ -49,7 +49,7 @@
 ** values: 0 .. 65535 (default value: `256`)
 
 * [[option_relay.network.allowed_ips]] *relay.network.allowed_ips*
-** description: `regular expression with IPs allowed to use relay, example: "^(123.45.67.89|192.160.*)$"`
+** description: `regular expression with IPs allowed to use relay (case insensitive, use "(?-i)" at beginning to make it case sensitive), example: "^(123.45.67.89|192.160.*)$"`
 ** type: string
 ** values: any string (default value: `""`)
 
diff --git a/doc/en/autogen/user/rmodifier_commands.txt b/doc/en/autogen/user/rmodifier_commands.txt
index e9cf8cd65..18906369e 100644
--- a/doc/en/autogen/user/rmodifier_commands.txt
+++ b/doc/en/autogen/user/rmodifier_commands.txt
@@ -12,7 +12,7 @@ listdefault: list default rmodifiers
        name: name of rmodifier
   modifiers: comma separated list of modifiers
      groups: action on groups found: comma separated list of groups (from 1 to 9) with optional "*" after number to hide group
-      regex: regular expression
+      regex: regular expression (case insensitive, can start by "(?-i)" to become case sensitive)
         del: delete a rmodifier
        -all: delete all rmodifiers
     default: restore default rmodifiers
diff --git a/doc/en/autogen/user/weechat_commands.txt b/doc/en/autogen/user/weechat_commands.txt
index 1c223fb79..f04f5bdc0 100644
--- a/doc/en/autogen/user/weechat_commands.txt
+++ b/doc/en/autogen/user/weechat_commands.txt
@@ -219,6 +219,7 @@ disable: disable filters
          - use '\t' to separate prefix from message, special chars like '|' must be escaped: '\|'
          - if regex starts with '!', then matching result is reversed (use '\!' to start with '!')
          - two regular expressions are created: one for prefix and one for message
+         - regex are case insensitive, they can start by "(?-i)" to become case sensitive
 
 The default key alt+'=' toggles filtering on/off.
 
diff --git a/doc/en/autogen/user/weechat_options.txt b/doc/en/autogen/user/weechat_options.txt
index f35a1fa24..128f5a2ac 100644
--- a/doc/en/autogen/user/weechat_options.txt
+++ b/doc/en/autogen/user/weechat_options.txt
@@ -449,12 +449,12 @@
 ** values: on, off (default value: `off`)
 
 * [[option_weechat.look.highlight]] *weechat.look.highlight*
-** description: `comma separated list of words to highlight (case insensitive comparison, words may begin or end with "*" for partial match)`
+** description: `comma separated list of words to highlight; case insensitive comparison (use "(?-i)" at beginning of words to make them case sensitive), words may begin or end with "*" for partial match; example: "test,(?-i)*toto*,flash*"`
 ** type: string
 ** values: any string (default value: `""`)
 
 * [[option_weechat.look.highlight_regex]] *weechat.look.highlight_regex*
-** description: `regular expression used to check if a message has highlight or not, at least one match in string must be surrounded by word chars (alphanumeric, "-", "_" or "|"), regular expression is case sensitive, example: "FlashCode|flashy"`
+** description: `regular expression used to check if a message has highlight or not, at least one match in string must be surrounded by word chars (alphanumeric, "-", "_" or "|"), regular expression is case insensitive (use "(?-i)" at beginning to make it case sensitive), examples: "flashcode|flashy", "(?-i)FlashCode|flashy"`
 ** type: string
 ** values: any string (default value: `""`)